WGL: pixel format attributes

[Roderick Colenbrander]

Hi,

This patch relaxes our pixel format attribute conversion code a bit. The code was for a part wrong as multiple 'different' options touched GLX_X_RENDERABLE. All could be set at the same time and 'undo' each other. This caused issues in some demos and games. Second the number of pixelformats we support is limited to 1 right now. Due to this setting of this flag to false prevents us from selecting any formats (all formats we support are renderable by X). We have to 'lie' to prevent programs from crashing.

Regards,
Roderick Colenbrander
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