Fixed the shared library build of D8 that was broken by r9005.

Review URL: http://codereview.chromium.org/7701024

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9006 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/d8.cc

@@ -1287,7 +1287,10 @@ int Shell::Main(int argc, char* argv[]) {
   }
 
   V8::Dispose();
+
+#ifndef V8_SHARED
   OnExit();
+#endif  // V8_SHARED
 
   return result;
 }