[gtk+] dnd-quartz: fix missing icon helper include

[Christoph Reiter <creiter src gnome org>]

commit ee3397388ff689a965ed3c9c04ad390605e40232
Author: Christoph Reiter <creiter src gnome org>
Date:   Wed Nov 25 20:27:21 2015 +0100

    dnd-quartz: fix missing icon helper include

 gtk/gtkdnd-quartz.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkdnd-quartz.c b/gtk/gtkdnd-quartz.c
index 594a76c..959f072 100644
--- a/gtk/gtkdnd-quartz.c
+++ b/gtk/gtkdnd-quartz.c
@@ -42,6 +42,7 @@
 #include "gdk/quartz/gdkquartz.h"
 #include "gtkselectionprivate.h"
 #include "gtksettings.h"
+#include "gtkiconhelperprivate.h"
 
 typedef struct _GtkDragSourceSite GtkDragSourceSite;
 typedef struct _GtkDragSourceInfo GtkDragSourceInfo;