Adding Wunused-local-typedef build flag (#86154)
# Summary
In the past, we have seen PRs causing internal breakages caused by `-Wunused-local-typedef` flag which than had to be fixed. For example: [#79978](https://github.com/pytorch/pytorch/pull/79978)
As part of this change, we want to catch this error in the PR Checks itself.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86154
Approved by: https://github.com/huydhn, https://github.com/seemethere, https://github.com/osalpekar
