WGL: make sure onscreen pixelformats are on top in wglChoosePixelFormatARB

[Roderick Colenbrander]

Hi,

Recently Nvidia changed the behavior of their glXChooseFBConfig. Due to this 
change offscreen pixelformats can appear on top of the list returned by the 
call. This cause problems for programs (see bug 9186) as all programs 
implicitly assume that (most) returned formats are onscreen. They don't check 
the capabilities.

Regards,
Roderick Colenbrander
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