attribute visible for gcc but not APPLE

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/856005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@384 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 383
+Version: 384
 License: BSD
 License File: LICENSE
 

include/libyuv/basic_types.h

@@ -85,7 +85,7 @@ typedef signed char int8;
 #else
 #define LIBYUV_API
 #endif  // LIBYUV_BUILDING_SHARED_LIBRARY
-#elif defined(__GNUC__) && __GNUC__ >= 4 && \
+#elif defined(__GNUC__) && (__GNUC__ >= 4) && !defined(__APPLE__) && \
     (defined(LIBYUV_BUILDING_SHARED_LIBRARY) || \
     defined(LIBYUV_USING_SHARED_LIBRARY))
 #define LIBYUV_API __attribute__ ((visibility ("default")))

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 383
+#define LIBYUV_VERSION 384
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT