[lld] [LLD] Fix preprocessor condition when getting lld version (PR #98137)

[Martin Storsjö via llvm-commits]

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

LGTM

(We don't use change-ids in the commit message in this repo though, so perhaps that bit can be omitted.)

https://github.com/llvm/llvm-project/pull/98137