[libc-commits] [libc] [libc][wait] hard code __W_CONTINUED for SYS_waitid fallback (PR #125929)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

LGTM, but we should look into adding some macro to define this value as a followup. It looks like the same value is used in `WIFCONTINUED`

https://github.com/llvm/llvm-project/pull/125929