WGL: pbuffer improvements 3

[Roderick Colenbrander]

This patch enables the newly added offscreen formats for use with pbuffers. 
Note that this function uses a GLX 1.3 function (glXCreateNewContext). This 
function is needed to handle fbconfigs without a visual. Such fbconfigs only 
exist on GLX 1.3 or higher (without glXCreateNewContext you can't even use 
them).

Roderick Colenbrander
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