[gtk+] build: only compile plug/socket when available

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 5bb9c1891ced2699bfc9d92acd8adf7b6167de26
Author: Christian Hergert <christian hergert me>
Date:   Fri Sep 4 14:06:22 2015 -0700

    build: only compile plug/socket when available
    
    Plug and Socket require X11 windowing. Often times this is compiled
    on systems with both wayland and x11, but not always. Quartz is an
    example where it is usually not compiled.

 testsuite/gtk/notify.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/testsuite/gtk/notify.c b/testsuite/gtk/notify.c
index 91492cc..505c066 100644
--- a/testsuite/gtk/notify.c
+++ b/testsuite/gtk/notify.c
@@ -417,11 +417,10 @@ test_type (gconstpointer data)
   /* Backend-specific */
 #ifdef GDK_WINDOWING_X11
   if (GDK_IS_X11_DISPLAY (gdk_display_get_default ())) ;
-  else
-#endif
-  if (g_type_is_a (type, GTK_TYPE_PLUG) ||
-      g_type_is_a (type, GTK_TYPE_SOCKET))
+  else if (g_type_is_a (type, GTK_TYPE_PLUG) ||
+           g_type_is_a (type, GTK_TYPE_SOCKET))
     return;
+#endif
 
 #ifdef GDK_WINDOWING_WAYLAND
   if (GDK_IS_WAYLAND_DISPLAY (gdk_display_get_default ()))