SCons: Remove unused DEBUG_MEMORY_ENABLED define

Its last use was removed in Godot 3.0, so it no longer makes sense to define.

Also removed `D3D_DEBUG_INFO` for Windows as it's likely a left over from a
long time ago pre-opensourcing when Godot had some form of Direct3D 9 support?

(cherry picked from commit dcf902df85)

platform/android/detect.py

@@ -164,7 +164,7 @@ def configure(env):
     elif env["target"] == "debug":
         env.Append(LINKFLAGS=["-O0"])
         env.Append(CCFLAGS=["-O0", "-g", "-fno-limit-debug-info"])
-        env.Append(CPPDEFINES=["_DEBUG", "DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED"])
+        env.Append(CPPDEFINES=["_DEBUG", "DEBUG_ENABLED"])
         env.Append(CPPFLAGS=["-UNDEBUG"])
 
     # Compiler configuration

platform/iphone/detect.py

@@ -62,7 +62,7 @@ def configure(env):
 
     elif env["target"] == "debug":
         env.Append(CCFLAGS=["-gdwarf-2", "-O0"])
-        env.Append(CPPDEFINES=["_DEBUG", ("DEBUG", 1), "DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED"])
+        env.Append(CPPDEFINES=["_DEBUG", ("DEBUG", 1), "DEBUG_ENABLED"])
 
     if env["use_lto"]:
         env.Append(CCFLAGS=["-flto"])

platform/osx/detect.py

@@ -66,7 +66,7 @@ def configure(env):
 
     elif env["target"] == "debug":
         env.Prepend(CCFLAGS=["-g3"])
-        env.Prepend(CPPDEFINES=["DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED"])
+        env.Prepend(CPPDEFINES=["DEBUG_ENABLED"])
 
     ## Architecture
 

platform/server/detect.py

@@ -78,7 +78,7 @@ def configure(env):
 
     elif env["target"] == "debug":
         env.Prepend(CCFLAGS=["-g3"])
-        env.Prepend(CPPDEFINES=["DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED"])
+        env.Prepend(CPPDEFINES=["DEBUG_ENABLED"])
         env.Append(LINKFLAGS=["-rdynamic"])
 
     ## Architecture

platform/uwp/detect.py

@@ -69,7 +69,7 @@ def configure(env):
     elif env["target"] == "debug":
         env.Append(CCFLAGS=["/Zi"])
         env.Append(CCFLAGS=["/MDd"])
-        env.Append(CPPDEFINES=["DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED"])
+        env.Append(CPPDEFINES=["DEBUG_ENABLED"])
         env.Append(LINKFLAGS=["/SUBSYSTEM:CONSOLE"])
         env.Append(LINKFLAGS=["/DEBUG"])
 

platform/windows/detect.py

@@ -196,7 +196,7 @@ def configure_msvc(env, manual_msvc_config):
 
     elif env["target"] == "debug":
         env.AppendUnique(CCFLAGS=["/Z7", "/Od", "/EHsc"])
-        env.AppendUnique(CPPDEFINES=["DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED", "D3D_DEBUG_INFO"])
+        env.AppendUnique(CPPDEFINES=["DEBUG_ENABLED"])
         env.Append(LINKFLAGS=["/SUBSYSTEM:CONSOLE"])
         env.Append(LINKFLAGS=["/DEBUG"])
 
@@ -325,7 +325,7 @@ def configure_mingw(env):
 
     elif env["target"] == "debug":
         env.Append(CCFLAGS=["-g3"])
-        env.Append(CPPDEFINES=["DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED"])
+        env.Append(CPPDEFINES=["DEBUG_ENABLED"])
 
     ## Compiler configuration
 

platform/x11/detect.py

@@ -109,7 +109,7 @@ def configure(env):
 
     elif env["target"] == "debug":
         env.Prepend(CCFLAGS=["-g3"])
-        env.Prepend(CPPDEFINES=["DEBUG_ENABLED", "DEBUG_MEMORY_ENABLED"])
+        env.Prepend(CPPDEFINES=["DEBUG_ENABLED"])
         env.Append(LINKFLAGS=["-rdynamic"])
 
     ## Architecture