[libcxx-commits] [libcxx] [libc++][C++03] Split libc++-specific tests for the frozen headers (PR #144093)

[Louis Dionne via libcxx-commits]

================

----------------
ldionne wrote:

Extension, however the comment is wrong, it should say:

```
// Make sure that libc++ headers work when defining _XOPEN_SOURCE=[500..700]
```

https://github.com/llvm/llvm-project/pull/144093