[libc-commits] [libc] [libc][cpio] Add cpio.h header. (PR #123798)

[Nick Desaulniers via libc-commits]

https://github.com/nickdesaulniers approved this pull request.

LGTM; thanks for the patch! Do you need us to merge this for you?

https://github.com/llvm/llvm-project/pull/123798