[clang] [lld] [llvm] Rename -macosx_version_min to -macos_version_min (PR #88810)

[Leland Jansen via cfe-commits]

lelandjansen wrote:

> Perhaps good to edit the PR title, it mentions the same flag twice at the moment.

Good catch. Thank you.

https://github.com/llvm/llvm-project/pull/88810