[libc-commits] [libc] [libc][sys/wait][linux] add missing and clean up existing macros (PR #125572)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

> (seemed plausible to me, but i'm assuming you want an llvm-libc committer's review...)

I want _you_ to be an llvm-libc _committer_ **and** _reviewer_ :wink: .  If you expect me to be for bionic, than it's only reciprocal.

https://github.com/llvm/llvm-project/pull/125572