Use no attribute on gcc unless using shared lib or making shared lib

BUG=none
TEST=none

git-svn-id: http://libyuv.googlecode.com/svn/trunk@382 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 381
+Version: 382
 License: BSD
 License File: LICENSE
 

include/libyuv/basic_types.h

@@ -84,14 +84,15 @@ typedef signed char int8;
 #define LIBYUV_API __declspec(dllimport)
 #else
 #define LIBYUV_API
-#endif
-#else
-#if defined(__GNUC__) && __GNUC__ >= 4
+#endif  // LIBYUV_BUILDING_SHARED_LIBRARY
+#else  // WIN32
+#if defined(__GNUC__) && __GNUC__ >= 4 && \
+    (defined(LIBYUV_BUILDING_SHARED_LIBRARY) || \
+    defined(LIBYUV_USING_SHARED_LIBRARY))
 #define LIBYUV_API __attribute__ ((visibility ("default")))
 #else
 #define LIBYUV_API
-#endif
-#endif
-#endif
+#endif  // __GNUC__
+#endif  // LIBYUV_API
 
 #endif  // INCLUDE_LIBYUV_BASIC_TYPES_H_  NOLINT

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 381
+#define LIBYUV_VERSION 382
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT