[lld] [LLD][COFF] Don't dllimport from static libraries (PR #134443)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

Looking good from my point of view now, thanks! But please wait for @glandium to reconfirm before landing. (I'm holding off of the approve-button until then.)

https://github.com/llvm/llvm-project/pull/134443