[compiler-rt] [compiler-rt] Don't link builtins against the CRT on Windows (PR #70675)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

This looks mostly reasonable to me, just a couple minor points. (But it might be good to have a few extra opinions.)

https://github.com/llvm/llvm-project/pull/70675