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driconf: Re-enable GLX_EXT_buffer_age on vmwgfx

Ian Forbes requested to merge iforbes/mesa:reenable-glx-ext-buffer-age into main

What does this MR do and why?

driconf: Re-enable GLX_EXT_buffer_age on vmwgfx

Now that distributions are no longer installing device specific Xorg
drivers by default we have to rely on modesetting driver which currently does
not work with glXCopySubBuffer. Both kwin and mutter prefer using glXSwapBuffers
over glXCopySubBuffer if GLX_EXT_buffer_age is present. Therefore we want to
ensure that it is available in order to avoid using the broken glXCopySubBuffer.

Signed-off-by: Ian Forbes <ian.forbes@broadcom.com>

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