[libcxx-commits] [libcxx] [libc++] Add CI job for testing macOS C++03 (PR #75355)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 approved this pull request.

I'm a bit surprised this got merged. I mentioned that this won't work until the next release on discord. (And apparently we have to wait until the next AppleClang update too)

LGTM.

https://github.com/llvm/llvm-project/pull/75355