WGL: proper stereo / double buffering support for ChoosePixelFormat

[Roderick Colenbrander]

Hi,

This patch makes us properly support double buffering / stereo. In all our 
previous attempts we discarded a format when it didn't have one of the 
requested flags (PFD_STEREO / PFD_DOUBLEBUFFERING) set.

The incorrect handling of the flags was due to unclear MSDN documentation and 
it was hard to test on Windows. By accident I had access to an old card which 
didn't support stereo. Tests on that card indicated that when PFD_STEREO is 
not set, formats without should be returned. This fixes bug 7015 (crash on 
Doom III) and it will also help bug 6812.

Regards,
Roderick Colenbrander
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