googletest

Add support for compiling GoogleTest for Xbox

Support for Xbox platforms, requires the code to support compilation with the
WINAPI_FAMILY_GAMES subset of the Win32 API.

- Add support for WINAPI_FAMILY_GAMES to enable GTEST_OS_WINDOWS_GAMES platform.
- Disable stream redirection (GTEST_HAS_STREAM_REDIRECTION = 0) and colored TTY
  printing for GTEST_OS_WINDOWS_GAMES platform. Both features currently require
  Win32 functions that don't exist in the WINAPI_FAMILY_GAMES subset.

Misc fixes:
- gtest-port.cc: Move GTEST_DISABLE_MSC_DEPRECATED_PUSH_ into
  GTEST_HAS_STREAM_REDIRECTION conditional section where the corresponding
  GTEST_DISABLE_MSC_DEPRECATED_POP_ is located.
- googletest-port-test.cc: Switch stream redirection tests to be conditional on
  GTEST_HAS_STREAM_REDIRECTION instead of !defined(GTEST_OS_WINDOWS_MOBILE).