[gegl] Use forward declaration to avoid an include

[Daniel Sabo <daniels src gnome org>]

commit 21cd8045e4864e2de90b98e72ac9670b0c48b922
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Fri Mar 29 20:39:30 2013 -0700

    Use forward declaration to avoid an include

 gegl/buffer/gegl-buffer.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gegl/buffer/gegl-buffer.h b/gegl/buffer/gegl-buffer.h
index 8b78c51..8962fbf 100644
--- a/gegl/buffer/gegl-buffer.h
+++ b/gegl/buffer/gegl-buffer.h
@@ -23,7 +23,6 @@
 #include <babl/babl.h>
 #include <gegl-matrix.h>
 #include <gegl-enums.h>
-#include <gegl-buffer-backend.h>
 
 G_BEGIN_DECLS
 
@@ -33,6 +32,7 @@ G_BEGIN_DECLS
 #ifndef __GEGL_BUFFER_TYPES_H__
 typedef struct _GeglBuffer   GeglBuffer;
 typedef struct _GeglSampler  GeglSampler;
+typedef struct _GeglTileBackend GeglTileBackend;
 #endif
 
 /***