X11DRV: fix fbconfig regression

[Roderick Colenbrander]

Ati doesn't advertise GLX_SGIX_fbconfig. They only advertise a GLX client version of 1.3. Because the Xserver only supports 1.2, the reported version is also 1.2 (only the client version number is 1.3, the rest not).

Roderick

> Roderick Colenbrander wrote:
> > The issue is that ATI's drivers don't advertise GLX_SGIX_fbconfig (which
> really all opengl drivers do) but on the other hand they advertise GLX
> client version 1.3 which promoted GLX_SGIX_fbconfig to core functionality. So
> ATI doesn't advertise GLX_SGIX_fbconfig but it is available because their
> libs are 1.3. They only ship the 1.3 functions so not the SGIX ones.
> > 
> 
> So, ATI correctly advertises what they support, I don't see any reason 
> to have workarounds there.
> 
> tom

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