[libcxx-commits] [libcxx] [libc++] FreeBSD CI: Adds `<signal.h>` to `check_assertion.h` (PR #78863)

[Konstantin Varlamov via libcxx-commits]

var-const wrote:

Let's keep an eye on the FreeBSD build on Buildkite, but I expect this commit to fix the issue.

https://github.com/llvm/llvm-project/pull/78863