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

[Reid Kleckner via llvm-commits]

rnk wrote:

Can we handle this like `_load_config_used`, so the symbol only appears when referenced, kind of like with a static archive?
https://github.com/llvm/llvm-project/blob/main/lld/COFF/Driver.cpp#L2427

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