[llvm] [lit] Disable ulimit-nodarwin test on FreeBSD (PR #173155)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. I should probably refactor this at some point after I better understand the landscape of what ulimit features are supported where. The portability of ulimit features in lit turned out to be significantly more complicated than I originally thought.

https://github.com/llvm/llvm-project/pull/173155