[libc-commits] [libc] [libc] Small recvfrom fixes (yaml, unpoison) (PR #111020)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

`man 2 recvfrom` doesn't mention `const` for any of the parameters. `restrict` and `_Nullable` would be nice to add (IIRC, `restrict` isn't supported in C++ except via compiler extension.

https://github.com/llvm/llvm-project/pull/111020