[clang] [llvm] Revert "workflows/release-binaries: Disable flang on Darwin (#164667)" (PR #216667)

[Cullen Rhodes via llvm-commits]

https://github.com/c-rhodes approved this pull request.

LGTM but just one minor point, this doesn't resolve #160546, that would be whatever actually fixed it. But I agree it should be closed if you can no longer reproduce

https://github.com/llvm/llvm-project/pull/216667