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

[James Henderson via llvm-commits]

jh7370 wrote:

What version of FreeBSD is the minimum supported for building LLVM? As far as I can see, this change is only valid if the minimum supported FreeBSD is v13 or greater. From the nature of the comment, it's clear that it was known that the change that allows the test to pass occurs in FreeBSD 13, so at the time this comment was introduced, it's clear that we needed to care about v12 and older.

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