[backport to Xwayland 23.1] test: Use either wayland-info or weston-info

weston-info has been deprecated for quite some time, whereas wayland-info may not be available yet.

So we use either, depending on what's actually available.

Signed-off-by: Olivier Fourdan ofourdan@redhat.com Reviewed-by: Michel Dänzer mdaenzer@redhat.com (cherry picked from commit fc625fe1)