X11Drv/OpenGL pixelformat rewrite

[Roderick Colenbrander]

The issue is that the line isn't error in all cases. Most of the time only iPixelFormat 1 and the offscreen formats are valid values. But for some queries like how much pixelformats exist a program can pass garbage aswell. This processing is done at a later stage because of this, it could be changed to a warning at some stage.

Roderick

> Testing with World of Warcraft, the game runs fine, but I see this in
> the console:
> 
> err:wgl:wglGetPixelFormatAttribivARB Unable to convert iPixelFormat 0 to
> a GLX one, expect problems!
> 
> tom
> 

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