automake: add more missing options for make distcheck

Namely - opencl, osmesa (only the gallium flavour as it conflicts with
the classic one), surfaceless egl platform and a couple gallium drivers
(virgl and vc4).

Cc: "11.1 11.2" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
1 file changed