[gtk+] gtk/gtkwin32theme.c: Include gdk/gdkprivate.h

[Chun-wei Fan <fanchunwei src gnome org>]

commit a601e5d10e74f9d029751f4d636d528fb21c5a49
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Oct 24 16:12:58 2017 +0800

    gtk/gtkwin32theme.c: Include gdk/gdkprivate.h
    
    We still need to access the GdkEvent structure here directly, as using
    the GdkEvent getters is likely not worth the trouble involved.
    
    Please see Emmanuele's comment (#97) of the following bug URL.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773299

 gtk/gtkwin32theme.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwin32theme.c b/gtk/gtkwin32theme.c
index 13faff8..faedfbc 100644
--- a/gtk/gtkwin32theme.c
+++ b/gtk/gtkwin32theme.c
@@ -25,6 +25,8 @@
 
 #include "gtkwin32drawprivate.h"
 
+#include "gdk/gdk-private.h"
+
 #ifdef G_OS_WIN32
 
 #include <windows.h>