[libc-commits] [libc] [libc] Enable `-Wunused` and clean up found instances (PR #96949)

[Michael Jones via libc-commits]

michaelrj-google wrote:

hi, yes I can review this. It got lost in my inbox so I just now saw it. For cleanup that's just running a build (probably with `ninja check-libc`) and finding what errors show up and fixing them. I can give more instruction if you would like.

https://github.com/llvm/llvm-project/pull/96949