Add workaround for Intel 965/963 not exporting glGenBuffers.
Add workaround for Intel 965/963 not exporting glGenBuffers.

niklaskorz/pyglet,niklaskorz/pyglet,seeminglee/pyglet64,niklaskorz/pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,seeminglee/pyglet64,seeminglee/pyglet64,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet