build: Enable xwayland-test during distcheck
build: Enable xwayland-test during distcheck

The replacement xwayland-test should succeed, so we should run it
from distcheck again.

Signed-off-by: Derek Foreman <2f97e0f0bc172406aab8ccd42dab54c95bab8759@osg.samsung.com>
Reviewed-by: Daniel Stone <62e7e355d5d8400fa8384448796af0bf6be4ffae@collabora.com>

giucam/weston,jonnylamb/weston,jonnylamb/weston,mchalupa/weston,xorgy/weston,Fantu/compositor-spice,xorgy/weston,eyolfson/weston,krezovic/weston,Tarnyko/weston-xdg_surface_present,giucam/weston,mchalupa/weston,krezovic/weston,udoprog/weston,eyolfson/weston,Gnurou/weston,udoprog/weston,Gnurou/weston,sir-murray/weston,Tarnyko/weston-xdg_surface_present,Fantu/compositor-spice,kwm81/weston,kwm81/weston,Fantu/compositor-spice,sir-murray/weston