Move V8EXPORT definition to its own file

include/v8-testing.h

Index: include/v8-testing.h
diff --git a/include/v8-testing.h b/include/v8-testing.h
index 59eebf9db47774b5a83b208f91badcf282b80f90..1e55b3b6edb86f3258a0cb7de291fc34548ed228 100644
--- a/include/v8-testing.h
+++ b/include/v8-testing.h
@@ -30,36 +30,6 @@
 
 #include "v8.h"
 
-#ifdef _WIN32
-// Setup for Windows DLL export/import. See v8.h in this directory for
-// information on how to build/use V8 as a DLL.
-#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED)
-#error both BUILDING_V8_SHARED and USING_V8_SHARED are set - please check the\
-  build configuration to ensure that at most one of these is set
-#endif
-
-#ifdef BUILDING_V8_SHARED
-#define V8EXPORT __declspec(dllexport)
-#elif USING_V8_SHARED
-#define V8EXPORT __declspec(dllimport)
-#else
-#define V8EXPORT
-#endif
-
-#else  // _WIN32
-
-// Setup for Linux shared library export. See v8.h in this directory for
-// information on how to build/use V8 as shared library.
-#if defined(__GNUC__) && ((__GNUC__ >= 4) || \
-    (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) && defined(V8_SHARED)
-#define V8EXPORT __attribute__ ((visibility("default")))
-#else
-#define V8EXPORT
-#endif
-
-#endif  // _WIN32
-
-
 /**
  * Testing support for the V8 JavaScript engine.
  */