glx: revert "Downgrade sRGB-ful fbconfigs"
This reverts f0861c80 which causes regression on multiple apps that require a sRGB capable visual. Closes: mesa/mesa#4690 Signed-off-by:Tapani Pälli <tapani.palli@intel.com> Reviewed-by:
Adam Jackson <ajax@redhat.com> Part-of: <mesa/mesa!10498> (cherry picked from commit fc408549)