Adds support for death tests in OpenBSD (by Paweł Hajdan Jr.)

include/gtest/internal/gtest-port.h

@@ -91,6 +91,7 @@
 //     GTEST_OS_LINUX_ANDROID - Google Android
 //   GTEST_OS_MAC      - Mac OS X
 //   GTEST_OS_NACL     - Google Native Client (NaCl)
+//   GTEST_OS_OPENBSD  - OpenBSD
 //   GTEST_OS_SOLARIS  - Sun Solaris
 //   GTEST_OS_SYMBIAN  - Symbian
 //   GTEST_OS_WINDOWS  - Windows (Desktop, MinGW, or Mobile)
@@ -242,6 +243,8 @@
 # define GTEST_OS_HPUX 1
 #elif defined __native_client__
 # define GTEST_OS_NACL 1
+#elif defined __OpenBSD__
+# define GTEST_OS_OPENBSD 1
 #endif  // __CYGWIN__
 
 // Brings in definitions for functions used in the testing::internal::posix
@@ -540,7 +543,8 @@
 // pops up a dialog window that cannot be suppressed programmatically.
 #if (GTEST_OS_LINUX || GTEST_OS_MAC || GTEST_OS_CYGWIN || GTEST_OS_SOLARIS || \
      (GTEST_OS_WINDOWS_DESKTOP && _MSC_VER >= 1400) || \
-     GTEST_OS_WINDOWS_MINGW || GTEST_OS_AIX || GTEST_OS_HPUX)
+     GTEST_OS_WINDOWS_MINGW || GTEST_OS_AIX || GTEST_OS_HPUX || \
+     GTEST_OS_OPENBSD)
 # define GTEST_HAS_DEATH_TEST 1
 # include <vector>  // NOLINT
 #endif