[libclc] [llvm] [libclc][CMake] Use clang/llvm-ar on Windows (PR #186726)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> When we build libclc as a subproject of LLVM, users expect LLVM CMake to configure libclc properly. It should not be their responsibility to change how they build LLVM to accommodate libclc.

What does your configuration look like exactly? From what I know the standard runtimes build is already configured like that. If you're doing a runtimes cross-build then you need to do it manually.

https://github.com/llvm/llvm-project/pull/186726