Valid value of AX_GLES_PROFILE: 0, 200, 300
By default, the AX_GLES_PROFILE is:
- android: 200, allow axmol apps runs on: API 17 Android 4.2+ devices
- winuwp: 300
- Win32/linux/osx/ios/tvos: 0
For ios/tvos, will forcing AX_GLES_PROFILE to 300 if AX_GLES_PROFILE not 0
In order to allow unity builds we need to avoiding "using namespace"
at file scope, #undef our file-specific #defines, and avoid having
static functions with identical name and signature.