[llvm] [llvm-ar] Enable failed testacase on FreeBSD (PR #192612)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

LGTM. Please add a mention to the commit message that Free BSD 12 is EOL, as that's the ultimate justification as to why it's safe to remove this thing.

https://github.com/llvm/llvm-project/pull/192612