[mutter/wip/lantw/wayland-on-freebsd: 5/5] main: Fix build when native backend is disabled

[Florian Müllner <fmuellner src gnome org>]

commit a5fd9a6e2f6e8a09bc7ed390ea828c4fc78a2806
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Fri Feb 16 04:42:48 2018 +0800

    main: Fix build when native backend is disabled

 src/core/main.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/core/main.c b/src/core/main.c
index 079f6a9ef..be7a90feb 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -432,7 +432,11 @@ calculate_compositor_configuration (MetaCompositorType *compositor_type,
 #ifdef HAVE_WAYLAND
   gboolean run_as_wayland_compositor = opt_wayland && !opt_x11;
 
+#ifdef HAVE_NATIVE_BACKEND
   if ((opt_wayland || opt_nested || opt_display_server) && opt_x11)
+#else
+  if ((opt_wayland || opt_nested) && opt_x11)
+#endif
     {
       meta_warning ("Can't run both as Wayland compositor and X11 compositing manager\n");
       meta_exit (META_EXIT_ERROR);