[gtk+] Fix undefined reference to get_xkb()

[Matthias Clasen <matthiasc src gnome org>]

commit 8ecc51ad8aa07ecad64d7732caa5fd78d9f43f4d
Author: Eric Le Bihan <eric le bihan dev free fr>
Date:   Thu Oct 23 13:00:54 2014 +0200

    Fix undefined reference to get_xkb()
    
    When configuring Gtk+ with --disable-xkb, the build fails because of an
    undefined reference to get_xkb().
    
    This patch fixes this issue.
    
    Signed-off-by: Eric Le Bihan <eric le bihan dev free fr>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739070

 gdk/x11/gdkkeys-x11.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/x11/gdkkeys-x11.c b/gdk/x11/gdkkeys-x11.c
index a83ec15..25df963 100644
--- a/gdk/x11/gdkkeys-x11.c
+++ b/gdk/x11/gdkkeys-x11.c
@@ -1499,8 +1499,10 @@ gdk_x11_keymap_map_virtual_modifiers (GdkKeymap       *keymap,
   int i, j;
   gboolean retval;
 
+#ifdef HAVE_XKB
   if (KEYMAP_USE_XKB (keymap))
     get_xkb (keymap_x11);
+#endif
 
   retval = TRUE;