[evolution] Remove an obsolete GTK+ header include.

[Matthew Barnes <mbarnes src gnome org>]

commit 00339ccb9568e19babebb5c90d666501d3ea60c4
Author: Matthew Barnes <mbarnes redhat com>
Date:   Tue Jun 29 11:19:06 2010 -0400

    Remove an obsolete GTK+ header include.

 libgnomecanvas/gnome-canvas-widget.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/libgnomecanvas/gnome-canvas-widget.c b/libgnomecanvas/gnome-canvas-widget.c
index f47180f..5c59f50 100644
--- a/libgnomecanvas/gnome-canvas-widget.c
+++ b/libgnomecanvas/gnome-canvas-widget.c
@@ -33,7 +33,6 @@
 
 #include <config.h>
 #include <math.h>
-#include <gtk/gtksignal.h>
 #include "gnome-canvas-widget.h"
 
 enum {