llvm dev - Nov 2019 - [cmake] llvm runtimes on Windows are not using clang-cl

Hello,

I've been trying to build libcxx on Windows using the
`-DLLVM_INCLUDE_RUNTIMES=On -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi"`
options.
However, it seems that LLVMExternalProjectUtils.cmake  insists on using `clang`
instead of `clang-cl` on Windows, causing CMake to error out.

This patch added support for using clang-cl:
https://github.com/llvm/llvm-project/commit/dc1c41fb6f096d5c3df5d58e2a6f49bb915e1c31
However, it seems that none of the CMake files under
`llvm-project/llvm/runtimes` are passing `DCMAKE_SYSTEM_NAME=Windows` when they
call the functions mentioned in the patch above, a requirement for that patch to
have any effects. No follow-up patches seem to have been submitted to exploit
the newly added feature.

Has anyone experienced similar problems?

Thanks!
--
Felipe

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