[gtk+] stack switcher: Add a missing include

[Matthias Clasen <matthiasc src gnome org>]

commit 826f729b6fae10ed34890c04ebc5b169f74f1521
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Mar 25 15:52:22 2016 -0400

    stack switcher: Add a missing include

 gtk/gtkstackswitcher.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkstackswitcher.c b/gtk/gtkstackswitcher.c
index 952ff2a..fb8a9a9 100644
--- a/gtk/gtkstackswitcher.c
+++ b/gtk/gtkstackswitcher.c
@@ -22,6 +22,7 @@
 #include "gtkradiobutton.h"
 #include "gtklabel.h"
 #include "gtkdnd.h"
+#include "gtkdragdest.h"
 #include "gtkorientable.h"
 #include "gtkprivate.h"
 #include "gtkintl.h"