glx: GLX_MESA_multithread_makecurrent is direct-only
This extension is not defined for indirect contexts. Marking it as "client only", as the old code did here, would make the extension available in indirect contexts, even though the server would certainly not have it in its extension list. Cc: <mesa-stable@lists.freedesktop.org> Signed-off-by:Adam Jackson <ajax@redhat.com> Reviewed-by:
Nicolai Hähnle <nicolai.haehnle@amd.com> Reviewed-by:
Emil Velikov <emil.velikov@collabora.com> (cherry picked from commit 63a6b719)