Make `Wunused-local-typedef` a hard error (#77918)
Only allow it for `libtorch_python` and tests
Helps prevent regression like https://github.com/pytorch/pytorch/pull/76547#issuecomment-1132208232
Pull Request resolved: https://github.com/pytorch/pytorch/pull/77918
Approved by: https://github.com/osalpekar, https://github.com/seemethere
