libweston-desktop/xwayland: debug commits

Helps tracking what happens with XWM.

Use the same debugging guard as XWM.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>

libweston-desktop/xwayland.c

@@ -132,6 +132,10 @@ weston_desktop_xwayland_surface_committed(struct weston_desktop_surface *dsurfac
 {
 	struct weston_desktop_xwayland_surface *surface = user_data;
 
+#ifdef WM_DEBUG
+	weston_log("%s: xwayland surface %p\n", __func__, surface);
+#endif
+
 	if (surface->has_next_geometry) {
 		surface->has_next_geometry = false;
 		weston_desktop_surface_set_geometry(surface->surface,