Move tests again from core to main

As advised by @reduz, as tests depend on other libs.

core/SCsub

@@ -61,7 +61,6 @@ SConscript('os/SCsub')
 SConscript('math/SCsub')
 SConscript('io/SCsub')
 SConscript('bind/SCsub')
-SConscript('tests/SCsub')
 
 lib = env.Library("core", env.core_sources)
 

main/SCsub

@@ -7,6 +7,8 @@ env.add_source_files(env.main_sources, "*.cpp")
 
 Export('env')
 
+SConscript('tests/SCsub')
+
 lib = env.Library("main", env.main_sources)
 
 env.Prepend(LIBS=[lib])

main/main.cpp

@@ -47,7 +47,7 @@
 #include "script_language.h"
 #include "io/resource_loader.h"
 
-#include "core/tests/test_main.h"
+#include "main/tests/test_main.h"
 #include "os/dir_access.h"
 #include "core/io/ip.h"
 #include "scene/resources/packed_scene.h"