fix windows ci

[fabinsch]

On Windows, ensure proper handling of both cl.exe and clang-cl.exe. Previously, our setup did not use clang-cl.exe.

[ManifoldFR]

clang-cl doesn't seem to like some boost::archive stuff

[jcarpent]

clang-cl doesn't seem to like some boost::archive stuff

Indeed, this is related to a current issue on conda-forge that @fabinsch is now fixing :)

[fabinsch]

Similar to our conda-feedstock, we now get a linker error on Windows with clang-cl.

Not setting the CMP0167 policy, e.g. removing this commit, results in a lot of warning but allows to compile and link on windows with clang-cl.

[jcarpent]

@fabinsch could you push your fix here?