make row_win windows code built with clangcl include the _posix source code.

depot_tools excludes these source files now, so they need to be manually
included.
BUG=435
TESTED=clangcl local build on windows
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/49879004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1395 16f28f9a-4ce2-e073-06de-1de4eb20be90

source/row_win.cc

@@ -23,7 +23,12 @@ extern "C" {
 
 // This module is for Visual C.
 #if !defined(LIBYUV_DISABLE_X86) && (defined(_M_IX86) || defined(_M_X64)) && \
-    defined(_MSC_VER) && !defined(__clang__)
+    defined(_MSC_VER)
+
+// ClangCL use posix source instead.
+#if defined(__clang__)
+#include "source/row_posix.cc"
+#else
 
 struct YuvConstants {
   lvec8 kUVToB;     // 0
@@ -6415,6 +6420,7 @@ void ARGBLumaColorTableRow_SSSE3(const uint8* src_argb, uint8* dst_argb,
 #endif  // HAS_ARGBLUMACOLORTABLEROW_SSSE3
 
 #endif  // defined(_M_X64)
+#endif  // defined(__clang__)
 #endif  // !defined(LIBYUV_DISABLE_X86) && (defined(_M_IX86) ...
 
 #ifdef __cplusplus