[gtk+] window: Fix compiler warning when not building for X11

[Rob Bradford <rbradford src gnome org>]

commit fe5146d8f27f868baee6549913ea271219769e36
Author: Rob Bradford <rob linux intel com>
Date:   Mon Apr 16 16:26:19 2012 +0100

    window: Fix compiler warning when not building for X11
    
    The callback function gtk_window_on_theme_variant_changed is only used on the
    X11 backend (where GtkSettings is used for the settings information.)
    
    Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=674207

 gtk/gtkwindow.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index a6ff07d..fe24363 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -422,9 +422,11 @@ static GtkKeyHash *gtk_window_get_key_hash        (GtkWindow   *window);
 static void        gtk_window_free_key_hash       (GtkWindow   *window);
 static void       gtk_window_on_composited_changed (GdkScreen *screen,
                                                     GtkWindow *window);
+#ifdef GDK_WINDOWING_X11
 static void        gtk_window_on_theme_variant_changed (GtkSettings *settings,
                                                         GParamSpec  *pspec,
                                                         GtkWindow   *window);
+#endif
 static void        gtk_window_set_theme_variant         (GtkWindow  *window);
 
 static GSList      *toplevel_list = NULL;
@@ -8336,6 +8338,7 @@ gtk_window_set_theme_variant (GtkWindow *window)
 #endif
 }
 
+#ifdef GDK_WINDOWING_X11
 static void
 gtk_window_on_theme_variant_changed (GtkSettings *settings,
                                      GParamSpec  *pspec,
@@ -8344,6 +8347,7 @@ gtk_window_on_theme_variant_changed (GtkSettings *settings,
   if (window->priv->type == GTK_WINDOW_TOPLEVEL)
     gtk_window_set_theme_variant (window);
 }
+#endif
 
 static void
 gtk_window_on_composited_changed (GdkScreen *screen,