graphics/gstreamer1-plugins-gl: unbreak with libglvnd/X11=off after e3b732b4791c

> gstreamer1-plugins-gl-1.22.2 depends on shared library: libGL.so - not found

> Installing existing package /packages/All/libglvnd-1.6.0.pkg

Installing libglvnd-1.6.0...
the most recent version of libglvnd-1.6.0 is already installed

> gstreamer1-plugins-gl-1.22.2 depends on shared library: libGL.so - not found

• Error code 1