[gtk+] tooltip: Include gtkwidgetprivate.h

[Timm Bäder <baedert src gnome org>]

commit fd81e801ab630400abbf13c3e1ef167691596f67
Author: Timm Bäder <mail baedert org>
Date:   Sun May 8 15:52:56 2016 +0200

    tooltip: Include gtkwidgetprivate.h
    
    That's where gtk_widget_query_tooltip is defined.

 gtk/gtktooltip.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtktooltip.c b/gtk/gtktooltip.c
index bcec21b..12a7b35 100644
--- a/gtk/gtktooltip.c
+++ b/gtk/gtktooltip.c
@@ -36,6 +36,7 @@
 #include "gtkstylecontext.h"
 #include "gtktooltipwindowprivate.h"
 #include "gtkwindowprivate.h"
+#include "gtkwidgetprivate.h"
 #include "gtkaccessible.h"
 
 #ifdef GDK_WINDOWING_WAYLAND