[llvm] Support: unlock Windows API support, switch to Windows 10 RS1+ APIs (PR #102240)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

Thanks - this version builds and runs fine - but sorry, I realized one thing about the loop we probably should tweak still.

https://github.com/llvm/llvm-project/pull/102240