_CRT_SECURE_NO_WARNINGS fix for windows

BUG=204
TEST=none
Review URL: https://webrtc-codereview.appspot.com/1227004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@616 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 615
+Version: 616
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 615
+#define LIBYUV_VERSION 616
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

util/psnr_main.cc

@@ -18,7 +18,9 @@
 //
 // Usage: psnr org_seq rec_seq -s width height [-skip skip_org skip_rec]
 
+#ifndef _CRT_SECURE_NO_WARNINGS
 #define _CRT_SECURE_NO_WARNINGS
+#endif
 
 #include <stddef.h>
 #include <stdio.h>