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multimedia/libva-glx: merge back into X11 option after 5343f55d8757

Description

multimedia/libva-glx: merge back into X11 option after 5343f55d8757

libva-glx -> libGL -> libva dependency loop doesn't occur with
libGL from libglvnd instead of mesa-*.

This reverts commit 14a6544d4e37ffa04cbf5e6a398d8e057198d4cd.