[gegl] buffer: fix a warning about implicit declaration of g_open

[Nils Philippsen <nphilipp src gnome org>]

commit eec9d266b37e650c332e9fb15ad15c8c8c5d24c7
Author: Nils Philippsen <nils redhat com>
Date:   Tue May 22 10:40:23 2012 +0200

    buffer: fix a warning about implicit declaration of g_open

 gegl/buffer/gegl-buffer-load.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gegl/buffer/gegl-buffer-load.c b/gegl/buffer/gegl-buffer-load.c
index 2c81ee8..6d9ea30 100644
--- a/gegl/buffer/gegl-buffer-load.c
+++ b/gegl/buffer/gegl-buffer-load.c
@@ -47,6 +47,7 @@
 #include "gegl-debug.h"
 
 #include <glib/gprintf.h>
+#include <glib/gstdio.h>
 
 typedef struct
 {