[lld] [LLD][COFF] Add -build-id flag to generate .buildid section. (PR #71433)

[Martin Storsjö via llvm-commits]

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

If nobody else wants to comment on this, I guess I can approve it.

(OTOH, if potential reviewers had a long weekend with a holiday, perhaps we can wait another day still before landing it?)

https://github.com/llvm/llvm-project/pull/71433