xwayland: Move xwl_surface_damage definition to xwayland-screen.c
It was already declared in xwayland-screen.h, and only takes a screen parameter, no window ones. Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
It was already declared in xwayland-screen.h, and only takes a screen parameter, no window ones. Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>