[empathy] Don't call XInitThreads in Wayland

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a9ede294c57bc5738be3c33cba4ef88b9a7d4a0e
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Jan 16 06:59:50 2016 -0600

    Don't call XInitThreads in Wayland
    
    This doesn't fix anything in particular, but seems like a good idea....

 src/empathy-call.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/src/empathy-call.c b/src/empathy-call.c
index 9919041..3bc1488 100644
--- a/src/empathy-call.c
+++ b/src/empathy-call.c
@@ -28,6 +28,7 @@
 #include <tp-account-widgets/tpaw-utils.h>
 
 #ifdef CLUTTER_WINDOWING_X11
+#include <gdk/gdkx.h>
 #include <X11/Xlib.h>
 #endif
 
@@ -215,9 +216,11 @@ main (int argc,
   g_setenv ("GST_DEBUG_DUMP_DOT_DIR", g_get_tmp_dir (), FALSE);
 
 #ifdef GDK_WINDOWING_X11
-  /* We can't call clutter_gst_init() before gtk_clutter_init(), so no choice
-   * but to intiialise X11 threading ourself */
-  XInitThreads ();
+  if (GDK_IS_X11_DISPLAY (gdk_display_get_default ())) {
+    /* We can't call clutter_gst_init() before gtk_clutter_init(), so no choice
+     * but to intiialise X11 threading ourself */
+    XInitThreads ();
+  }
 #endif
 
   optcontext = g_option_context_new (N_("- Empathy Audio/Video Client"));