[libc-commits] [libc] Reland "[libc] build fix for sigsetjmp (#137047)" (PR #137214)

[via libc-commits]

gulfemsavrun wrote:

> Should be fixed by [3591028](https://github.com/llvm/llvm-project/pull/137214/commits/3591028462d189befbe038e7a87bd9a08da7b26e)

With the above fix, the issue is resolved.
https://ci.chromium.org/b/8716676148318392433

https://github.com/llvm/llvm-project/pull/137214