Remove unused variable 'I422ToRGB565Row' that breaks osx builds.

BUG=426
TESTED=untested

Review URL: https://webrtc-codereview.appspot.com/48079004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1368 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1366
+Version: 1368
 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 1366
+#define LIBYUV_VERSION 1368
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/convert_from.cc

@@ -1025,11 +1025,6 @@ int I420ToRGB565Dither(const uint8* src_y, int src_stride_y,
                        uint8* dst_rgb565, int dst_stride_rgb565,
                        const uint8* dither4x4, int width, int height) {
   int y;
-  void (*I422ToRGB565Row)(const uint8* y_buf,
-                          const uint8* u_buf,
-                          const uint8* v_buf,
-                          uint8* rgb_buf,
-                          int width) = I422ToRGB565Row_C;
   void (*I422ToARGBRow)(const uint8* y_buf,
                         const uint8* u_buf,
                         const uint8* v_buf,