Patch thirdy-party libraries to build for WinRT

- Patch enet code.
- Patch OpenSSL code and add shims for unavailable API.
- Add extra definition header for Freetype.

drivers/builtin_openssl2/SCsub

@@ -642,6 +642,7 @@ openssl_sources = [
 
 # env.drivers_sources+=openssl_sources
 
+env.Append(CPPPATH=["#drivers/builtin_openssl2"])
 env_drivers.Append(CPPPATH=["#drivers/builtin_openssl2/crypto"])
 env_drivers.Append(CPPPATH=["#drivers/builtin_openssl2/openssl"])
 env_drivers.Append(CPPPATH=["#drivers/builtin_openssl2/crypto/evp"])
@@ -650,6 +651,9 @@ env_drivers.Append(CPPPATH=["#drivers/builtin_openssl2/crypto/modes"])
 # env_ssl.Append(CPPPATH=["#drivers/builtin_openssl2/crypto/store"])
 env_drivers.Append(CPPFLAGS=["-DOPENSSL_NO_ASM", "-DOPENSSL_THREADS", "-DL_ENDIAN"])
 
+if "platform" in env and env["platform"] == "winrt":
+	openssl_sources += ['winrt.cpp']
+
 # Workaround for compilation error with GCC/Clang when -Werror is too greedy (GH-4517)
 import os
 if not (os.name == "nt" and os.getenv("VSINSTALLDIR") != None):  # not Windows and not MSVC

drivers/builtin_openssl2/winrt.cpp

@@ -0,0 +1,127 @@
+/* Snippets extracted from https://github.com/Microsoft/openssl/blob/ec7e430e06e4e3ac87c183dee33cb216814cf980/ms/winrt.cpp
+ * Adapted for Godot definitions
+ */
+/* winrt.cpp
+ * Copyright 2014 Microsoft Corporation
+ * C++/CX Entropy/shims for Windows Phone/Windows Store platform
+ * written by Alejandro Jimenez Martinez
+ * (aljim@microsoft.com) for the OpenSSL project 2014.
+ */
+
+#include <windows.h>
+#if defined(WINAPI_FAMILY)
+extern "C" {
+unsigned entropyRT(BYTE *buffer, unsigned len);
+void RAND_add(const void *buf, int num, double entropy);
+int RAND_poll(void);
+}
+#endif
+
+unsigned entropyRT(BYTE *buffer, unsigned len) {
+	using namespace Platform;
+	using namespace Windows::Foundation;
+	using namespace Windows::Foundation::Collections;
+	using namespace Windows::Security::Cryptography;
+	using namespace Windows::Storage::Streams;
+	IBuffer ^ buf = CryptographicBuffer::GenerateRandom(len);
+	Array<unsigned char> ^ arr;
+	CryptographicBuffer::CopyToByteArray(buf, &arr);
+	unsigned arrayLen = arr->Length;
+
+	// Make sure not to overflow the copy
+	arrayLen = (arrayLen > len) ? len : arrayLen;
+	memcpy(buffer, arr->Data, arrayLen);
+	return arrayLen;
+}
+
+int RAND_poll(void) {
+	BYTE buf[60];
+	unsigned collected = entropyRT(buf, sizeof(buf));
+	RAND_add(buf, collected, collected);
+	return 1;
+}
+
+#if defined(WINRT_ENABLED)
+extern "C" {
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void *GetModuleHandle(
+		_In_opt_ LPCTSTR lpModuleName) {
+	return NULL;
+}
+//no log for phone
+int RegisterEventSource(
+		_In_ LPCTSTR lpUNCServerName,
+		_In_ LPCTSTR lpSourceName) {
+	return NULL;
+}
+
+int ReportEvent(
+		_In_ HANDLE hEventLog,
+		_In_ WORD wType,
+		_In_ WORD wCategory,
+		_In_ DWORD dwEventID,
+		_In_ PSID lpUserSid,
+		_In_ WORD wNumStrings,
+		_In_ DWORD dwDataSize,
+		_In_ LPCTSTR *lpStrings,
+		_In_ LPVOID lpRawData) {
+	return 0;
+}
+int MessageBox(
+		_In_opt_ HWND hWnd,
+		_In_opt_ LPCTSTR lpText,
+		_In_opt_ LPCTSTR lpCaption,
+		_In_ UINT uType) {
+	return 0;
+}
+int __cdecl GetProcessWindowStation(void) {
+	return NULL;
+}
+BOOL __cdecl GetUserObjectInformationW(
+		_In_ HANDLE hObj,
+		_In_ int nIndex,
+		_Out_opt_ PVOID pvInfo,
+		_In_ DWORD nLength,
+		_Out_opt_ LPDWORD lpnLengthNeeded) {
+	return 0;
+}
+int __cdecl GetStdHandle(
+		_In_ DWORD nStdHandle) {
+	return 0;
+}
+BOOL DeregisterEventSource(
+		_Inout_ HANDLE hEventLog) {
+	return 0;
+}
+char *getenv(
+		const char *varname) {
+	//hardcoded environmental variables used for the appx testing application for store/phone
+	if (!strcmp(varname, "OPENSSL_CONF")) {
+		return "./openssl.cnf";
+	}
+	return 0;
+}
+int setenv(const char *envname, const char *envval, int overwrite) {
+	return -1;
+}
+int _getch(void) {
+	return 0;
+}
+int _kbhit() {
+	return 0;
+}
+BOOL __cdecl FlushConsoleInputBuffer(
+		_In_ HANDLE hConsoleInput) {
+	return 0;
+}
+int winrt_GetTickCount(void) {
+	LARGE_INTEGER t;
+	return (int)(QueryPerformanceCounter(&t) ? t.QuadPart : 0);
+}
+void *OPENSSL_UplinkTable[26] = { 0 };
+} //extern C
+
+#endif /*defined(WINRT_ENABLED)*/

drivers/builtin_openssl2/winrt_fix.patch

@@ -0,0 +1,64 @@
+diff --git a/drivers/builtin_openssl2/crypto/rand/rand_win.c b/drivers/builtin_openssl2/crypto/rand/rand_win.c
+index 06670ae..70fd52a 100644
+--- a/drivers/builtin_openssl2/crypto/rand/rand_win.c
++++ b/drivers/builtin_openssl2/crypto/rand/rand_win.c
+@@ -118,8 +118,10 @@
+ # ifndef _WIN32_WINNT
+ #  define _WIN32_WINNT 0x0400
+ # endif
++#ifndef WINRT_ENABLED
+ # include <wincrypt.h>
+ # include <tlhelp32.h>
++#endif
+ 
+ /*
+  * Limit the time spent walking through the heap, processes, threads and
+@@ -161,7 +163,7 @@ typedef struct tagCURSORINFO {
+ #  define CURSOR_SHOWING     0x00000001
+ # endif                         /* CURSOR_SHOWING */
+ 
+-# if !defined(OPENSSL_SYS_WINCE)
++# if !defined(OPENSSL_SYS_WINCE) && !defined(WINRT_ENABLED)
+ typedef BOOL(WINAPI *CRYPTACQUIRECONTEXTW) (HCRYPTPROV *, LPCWSTR, LPCWSTR,
+                                             DWORD, DWORD);
+ typedef BOOL(WINAPI *CRYPTGENRANDOM) (HCRYPTPROV, DWORD, BYTE *);
+@@ -196,6 +198,7 @@ typedef NET_API_STATUS(NET_API_FUNCTION *NETFREE) (LPBYTE);
+ #  endif                        /* 1 */
+ # endif                         /* !OPENSSL_SYS_WINCE */
+ 
++#if !defined(WINRT_ENABLED)
+ int RAND_poll(void)
+ {
+     MEMORYSTATUS m;
+@@ -580,6 +583,8 @@ int RAND_poll(void)
+     return (1);
+ }
+ 
++#endif // WINRT_ENABLED
++
+ int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
+ {
+     double add_entropy = 0;
+@@ -682,7 +687,7 @@ static void readtimer(void)
+ 
+ static void readscreen(void)
+ {
+-# if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
++# if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN) && !defined(WINRT_ENABLED)
+     HDC hScrDC;                 /* screen DC */
+     HBITMAP hBitmap;            /* handle for our bitmap */
+     BITMAP bm;                  /* bitmap properties */
+diff --git a/drivers/builtin_openssl2/openssl/dtls1.h b/drivers/builtin_openssl2/openssl/dtls1.h
+index 64ad3c8..a58aca2 100644
+--- a/drivers/builtin_openssl2/openssl/dtls1.h
++++ b/drivers/builtin_openssl2/openssl/dtls1.h
+@@ -81,6 +81,9 @@
+ #   include <sys/time.h>
+ #  endif
+ # endif
++#ifdef WINRT_ENABLED
++#include <winsock2.h>
++#endif
+ 
+ #ifdef  __cplusplus
+ extern "C" {

drivers/freetype/winrtdef.h

@@ -0,0 +1,32 @@
+/*************************************************************************/
+/*  winrtdef.h                                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+// "generic" is a reserved keyword in C++/CX code
+// this avoids the errors in the variable name from Freetype code
+#define generic freetype_generic

thirdparty/openssl/crypto/rand/rand_win.c

@@ -118,8 +118,10 @@
 # ifndef _WIN32_WINNT
 #  define _WIN32_WINNT 0x0400
 # endif
+#ifndef WINRT_ENABLED
 # include <wincrypt.h>
 # include <tlhelp32.h>
+#endif
 
 /*
  * Limit the time spent walking through the heap, processes, threads and
@@ -161,7 +163,7 @@ typedef struct tagCURSORINFO {
 #  define CURSOR_SHOWING     0x00000001
 # endif                         /* CURSOR_SHOWING */
 
-# if !defined(OPENSSL_SYS_WINCE)
+# if !defined(OPENSSL_SYS_WINCE) && !defined(WINRT_ENABLED)
 typedef BOOL(WINAPI *CRYPTACQUIRECONTEXTW) (HCRYPTPROV *, LPCWSTR, LPCWSTR,
                                             DWORD, DWORD);
 typedef BOOL(WINAPI *CRYPTGENRANDOM) (HCRYPTPROV, DWORD, BYTE *);
@@ -196,6 +198,7 @@ typedef NET_API_STATUS(NET_API_FUNCTION *NETFREE) (LPBYTE);
 #  endif                        /* 1 */
 # endif                         /* !OPENSSL_SYS_WINCE */
 
+#if !defined(WINRT_ENABLED)
 int RAND_poll(void)
 {
     MEMORYSTATUS m;
@@ -580,6 +583,8 @@ int RAND_poll(void)
     return (1);
 }
 
+#endif // WINRT_ENABLED
+
 int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
 {
     double add_entropy = 0;
@@ -682,7 +687,7 @@ static void readtimer(void)
 
 static void readscreen(void)
 {
-# if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
+# if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN) && !defined(WINRT_ENABLED)
     HDC hScrDC;                 /* screen DC */
     HBITMAP hBitmap;            /* handle for our bitmap */
     BITMAP bm;                  /* bitmap properties */

thirdparty/openssl/openssl/dtls1.h

@@ -81,6 +81,9 @@
 #   include <sys/time.h>
 #  endif
 # endif
+#ifdef WINRT_ENABLED
+#include <winsock2.h>
+#endif
 
 #ifdef  __cplusplus
 extern "C" {