Yuri Kunde Schlesner a1a5570e97 Replace the previous OpenGL loader with a glad-generated 3.3 one
The main advantage of switching to glad from glLoadGen is that, apart
from being actively maintained, it supports a customizable entrypoint
loader function, which makes it possible to also support OpenGL ES.
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khrplatform.h Replace the previous OpenGL loader with a glad-generated 3.3 one