Add quake3 support.

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Try to get Quake3 or IOQuake3 working.

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IOQuake3 uses SDL2 as a window manager. It seems something in the WGL code is causing it to die.
It was the same for Xash3D.

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I was missing the WGL DescribePixel format function, this has now been implemented.

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I need to add support for the following functions:

glEnableClientState
glColorMask
glColorPointer
glTexCoordPointer
glVertexPointer
glArrayElement
glDisableClientState
glPolygonOffset