xwayland: Move includes to avoid deprecation warnings

compositor.h already helpfully defines WL_HIDE_DEPRECATED for us, so we
don't get warnings about wl_buffer (in particular) being deprecated when
we have wayland-server headers defining it as deprecated, and then
wayland-client headers using the type.

Move it to be before all our other includes, so we actually make use of
it.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>
Tested-by: Yong Bakos <ybakos@humanoriented.com>

xwayland/dnd.c

@@ -37,10 +37,10 @@
 #include <signal.h>
 #include <X11/Xcursor/Xcursor.h>
 
+#include "compositor.h"
 #include "xwayland.h"
 
 #include "cairo-util.h"
-#include "compositor.h"
 #include "hash.h"
 
 static void

xwayland/window-manager.c

@@ -38,11 +38,11 @@
 #include <X11/Xcursor/Xcursor.h>
 #include <linux/input.h>
 
+#include "compositor.h"
 #include "xwayland.h"
 #include "xwayland-internal-interface.h"
 
 #include "cairo-util.h"
-#include "compositor.h"
 #include "hash.h"
 #include "shared/helpers.h"