[FR] Add some more missing GL definitions

opengl

#1

Trying to log some info about the GL context among other things, and realised that Windows doesn’t provide these macros out of the box:

   #ifndef GL_MAJOR_VERSION
    GL_MAJOR_VERSION = 0x821b,
   #endif

   #ifndef GL_MINOR_VERSION
    GL_MINOR_VERSION = 0x821c,
   #endif