if building with gcc and sse2 is not enabled, disable assembly

BUG=none
TESTED=nacl build with default options
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/44389004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1298 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1296
+Version: 1298
 License: BSD
 License File: LICENSE
 

include/libyuv/row.h

@@ -39,6 +39,7 @@ extern "C" {
 
 #if defined(__pnacl__) || defined(__CLR_VER) || defined(COVERAGE_ENABLED) || \
     defined(TARGET_IPHONE_SIMULATOR) || \
+    (defined(__i386__) && !defined(__SSE2__)) || \
     (defined(_MSC_VER) && defined(__clang__))
 #define LIBYUV_DISABLE_X86
 #endif
@@ -189,6 +190,7 @@ extern "C" {
 #define HAS_I422TORGBAROW_AVX2
 #define HAS_NV12TOARGBROW_AVX2
 #define HAS_NV21TOARGBROW_AVX2
+#define HAS_ARGBTOARGB4444ROW_AVX2
 #endif
 
 // The following are available on all x86 platforms, but
@@ -216,7 +218,6 @@ extern "C" {
 #define HAS_YUY2TOUV422ROW_AVX2
 #define HAS_YUY2TOUVROW_AVX2
 #define HAS_YUY2TOYROW_AVX2
-#define HAS_ARGBTOARGB4444ROW_AVX2
 
 // The following require HAS_I422TOARGBROW_AVX2
 #if defined(HAS_I422TOARGBROW_AVX2)

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1296
+#define LIBYUV_VERSION 1298
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT