[libc-commits] [libc] [libc] Implement tmpfile and corresponding tests (PR #213396)

[Alexey Samsonov via libc-commits]

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

LGTM after fixing CMake deps (and nit below), but please wait for approval from @kaladron  or @michaelrj-google (either of them can merge this for you).

https://github.com/llvm/llvm-project/pull/213396