[clang] [clang] Support --sysroot= for ${arch}-windows-msvc targets (PR #96417)

[via cfe-commits]

trcrsired wrote:

> > Btw relying on wine is another thing i think is no-go.
> 
> Just to be clear - nobody here has suggested using wine for anything here. My repo [http://github.com/mstorsjo/msvc-wine/](https://github.com/mstorsjo/msvc-wine/) contains pure python/shell/perl scripts for downloading and unpacking MSVC. No wine needed. It also contains shell script wrappers for transparently using MSVC as if it was a native tool, using wine - but that's optional, you can use it just for downloading and getting MSVC libraries for use with Clang/LLVM without any use of wine anywhere. The repo name predates the downloader/unpacker.

still i do not see what is your objection to GNU style --sysroot for clang since that is what it designed for.

https://github.com/llvm/llvm-project/pull/96417