[dasher] Remove superfluous inclusion of gdkcairo.h .

[Patrick Welche <pwelche src gnome org>]

commit 8cb1cf2f6ece497a0b1b096e7e729e9eadd3eb9a
Author: Patrick Welche <prlw1 cam ac uk>
Date:   Thu Mar 31 20:27:14 2011 +0200

    Remove superfluous inclusion of gdkcairo.h .
    
    gdkcairo.h has been included from gdk.h since before our Canvas.h
    existed, so this include has never been necessary (and in view
    of gtk3 is now harmful).

 Src/Gtk2/Canvas.h |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/Src/Gtk2/Canvas.h b/Src/Gtk2/Canvas.h
index 7669ee9..610f4b0 100644
--- a/Src/Gtk2/Canvas.h
+++ b/Src/Gtk2/Canvas.h
@@ -14,9 +14,6 @@
 
 #if WITH_CAIRO
 
-/* Cairo drawing backend */
-#include <gdk/gdkcairo.h>
-
 #define BEGIN_DRAWING_BACKEND				\
   cairo_save(cr)