[clang] [Driver] Remove support for FreeBSD 13.x (PR #163847)

[Dimitry Andric via cfe-commits]

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

As long as this is committed when FreeBSD 13 actually goes EOL, I'm fine with it. :)


https://github.com/llvm/llvm-project/pull/163847