Add stdio include to skdiff_image.


git-svn-id: http://skia.googlecode.com/svn/trunk@11740 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/skdiff_image.cpp b/tools/skdiff_image.cpp
index 086fb09..172f62b 100644
--- a/tools/skdiff_image.cpp
+++ b/tools/skdiff_image.cpp
@@ -15,6 +15,8 @@
 #include "SkTemplates.h"
 #include "SkTypes.h"
 
+#include <stdio.h>
+
 /// If outputDir.isEmpty(), don't write out diff files.
 static void create_diff_images (DiffMetricProc dmp,
                                 const int colorThreshold,