[gtk+] Fix the build

[Matthias Clasen <matthiasc src gnome org>]

commit b7ad7ea91835bc13be1f0a2656e4029c08e8b74a
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Aug 31 11:31:24 2015 -0400

    Fix the build

 gdk/wayland/gdkdevice-wayland.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index 4e8f98f..50b3ffc 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -1165,6 +1165,8 @@ keyboard_handle_enter (void               *data,
   _gdk_wayland_display_deliver_event (device->display, event);
 }
 
+static void stop_key_repeat (GdkWaylandDeviceData *device);
+
 static void
 keyboard_handle_leave (void               *data,
                        struct wl_keyboard *keyboard,