Fixing MinGW build.

src/d8.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 799 matching lines @@
     }
     printf("+----------------------------------------+-------------+\n");
   }
   if (counters_file_ != NULL)
     delete counters_file_;
 }
 #endif  // V8_SHARED
 
 
 static FILE* FOpen(const char* path, const char* mode) {
-#if (defined(_WIN32) || defined(_WIN64))
+#if defined(_MSC_VER) && (defined(_WIN32) || defined(_WIN64))
   FILE* result;
   if (fopen_s(&result, path, mode) == 0) {
     return result;
   } else {
     return NULL;
   }
 #else
   FILE* file = fopen(path, mode);
   if (file == NULL) return NULL;
   struct stat file_stat;
@@ skipping 524 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif