WGL: silence an error in ConvertPixelFormatWGLtoGLX

[Roderick Colenbrander]

Hi,

The helper function ConvertPixelFormatWGLtoGLX is used a lot by WGL functions. 
When iPixelFormat=0 is passed to it, it can be good or bad depending on 
whether it is used for enumerating the total number of pixelformats or not.

The functions that use that use ConvertPixelFormatWGLtoGLX will complain when 
something is wrong, so this check can be silenced. It confuses a lot of 
users.

Regards,
Roderick Colenbrander
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