Implements death tests on Windows (by Vlad Losev); enables POSIX regex on Mac and Cygwin; fixes build issue on some Linux versions due to PATH_MAX.

test/gtest_output_test_.cc

@@ -988,7 +988,18 @@ int main(int argc, char **argv) {
   if (testing::internal::GTEST_FLAG(internal_run_death_test) != "") {
     // Skip the usual output capturing if we're running as the child
     // process of an threadsafe-style death test.
+#if GTEST_OS_WINDOWS
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable:4996)
+#endif  // _MSC_VER
+    freopen("nul:", "w", stdout);
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif  // _MSC_VER
+#else
     freopen("/dev/null", "w", stdout);
+#endif  // GTEST_OS_WINDOWS
     return RUN_ALL_TESTS();
   }
 #endif  // GTEST_HAS_DEATH_TEST