message: fix android debug build
diff: #include <GLES3/gl31.h>
  #include <GLES2/gl2ext.h>
  - /* The Android NDK doesn't exposes extensions, fake it with eglGetProcAddress */
  + /* The Android NDK doesn't expose extensions, fake it with eglGetProcAddress */
  namespace glext {
  // importGLESExtensionsEntryPoints is thread-safe and can be called multiple times.
  // it is currently called from PlatformEGL.
  #endif
  // Prevent lots of #ifdef's between desktop and mobile
  +
  +#if !defined(GL_KHR_debug)
  +# define GL_DEBUG_OUTPUT 0x92E0
  +# define GL_DEBUG_OUTPUT_SYNCHRONOUS 0x8242
  +
  +# define GL_DEBUG_SEVERITY_HIGH 0x9146
  +# define GL_DEBUG_SEVERITY_MEDIUM 0x9147
  +# define GL_DEBUG_SEVERITY_LOW 0x9148
  +# define GL_DEBUG_SEVERITY_NOTIFICATION 0x826B
  +
  +# define GL_DEBUG_TYPE_MARKER 0x8268
  +# define GL_DEBUG_TYPE_ERROR 0x824C
  +# define GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR 0x824D
  +# define GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR 0x824E
  +# define GL_DEBUG_TYPE_PORTABILITY 0x824F
  +# define GL_DEBUG_TYPE_PERFORMANCE 0x8250
  +# define GL_DEBUG_TYPE_OTHER 0x8251
  +
  # define glDebugMessageCallback glDebugMessageCallbackKHR
  +#endif
  /* The iOS SDK only provides OpenGL ES headers up to 3.0. Filament works with OpenGL 3.0, but
  * requires ES3.1 headers */
  