WineD3D: add better pixelformat selection code for pbuffers

[Roderick Colenbrander]

Hi,

In case of pbuffers there's a large number of pixelformats that we can use 
(even in case of winex11.drv although not all are active right now). I use 
wglChoosePixelFormatARB to try to find an exact match. When that doesn't work 
I'll fall back to ChoosePixelFormat as in case of Wine we can't always find 
an exact match (yet). On Windows it will help a lot.

Regards,
Roderick Colenbrander
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