[Libva] [PATCH] VA/GLX: drop GLX 1.3 requirement

[Gwenole Beauchesne]

Hi,

This patch drops the GLX 1.3 requirement. It was initially desired to make 
sure the TFP extensions are available. However, some drivers do support 
TFP but still expose GLX 1.2. For those, glXQueryExtensionsString() shall 
return GLX_EXT_texture_from_pixmap.

I have checked two GMA500 drivers and they operate correctly. e.g. one 
with support TFP and not for the other. Test pending for G45 chips but I 
believe this is OK too. i.e. GLX_EXT_texture_from_pixmap is only reported 
as server & client extensions, not as plain GLX extensions.

Thanks,
Gwenole.
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