llvm64 link error fix.

R=harryjin@google.com
BUG=libyuv:485

Review URL: https://webrtc-codereview.appspot.com/58479004.

.gitignore

 *.pyc
 .gn
+pin-log.txt
 build
 buildtools
 chromium/.gclient.tmp

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1472
+Version: 1473
 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 1472
+#define LIBYUV_VERSION 1473
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/row_common.cc

@@ -2159,7 +2159,8 @@ void I422ToUYVYRow_C(const uint8* src_y,
 // Maximum temporary width for wrappers to process at a time, in pixels.
 #define MAXTWIDTH 2048
 
-#if !defined(_MSC_VER) && defined(HAS_I422TORGB565ROW_SSSE3)
+#if !(defined(_MSC_VER) && defined(_M_IX86)) && \
+    defined(HAS_I422TORGB565ROW_SSSE3)
 // row_win.cc has asm version, but GCC uses 2 step wrapper.
 void I422ToRGB565Row_SSSE3(const uint8* src_y,
                            const uint8* src_u,