message: Set Windows language level to C++17
diff: @@ -76,8 +76,10 @@ build:linux --cxxopt=-std=c++14
  build:linux --host_cxxopt=-std=c++14
  build:macos --cxxopt=-std=c++14
  build:macos --host_cxxopt=-std=c++14
  -build:windows --cxxopt=/std:c++14
  -build:windows --host_cxxopt=/std:c++14
  +
  +# Under Windows, the Visual Studio compiler requires C++17
  +build:windows --cxxopt=/std:c++17
  +build:windows --host_cxxopt=/std:c++17
  # Config to use a mostly-static build and disable modular op registration
  # support (this will revert to loading TensorFlow with RTLD_GLOBAL in Python).
  