[gnome-panel] panel-run-dialog: add missing include

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 6ca0957916aa98c90e4ca32b0502de959688b58b
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Dec 19 02:27:23 2016 +0200

    panel-run-dialog: add missing include

 gnome-panel/panel-run-dialog.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gnome-panel/panel-run-dialog.c b/gnome-panel/panel-run-dialog.c
index d447355..490317c 100644
--- a/gnome-panel/panel-run-dialog.c
+++ b/gnome-panel/panel-run-dialog.c
@@ -39,6 +39,7 @@
 #include <glib/gi18n.h>
 #include <gio/gio.h>
 #include <gdk/gdkkeysyms.h>
+#include <gdk/gdkx.h>
 #include <gmenu-tree.h>
 
 #include <libpanel-util/panel-error.h>