[lld] [LLD][COFF] add __build_guid symbol. (PR #74652)

[Reid Kleckner via llvm-commits]

https://github.com/rnk commented:

I think we should go back to `__buildid`, I withdraw my suggestion for a more descriptive name. I'm just concerned someone will come along and tell us "this is not really a GUID", and then we'll look silly for using this name.

https://github.com/llvm/llvm-project/pull/74652