[libcxx] [libcxxabi] [libunwind] [runtimes] Always define cxx_shared, cxx_static & other targets (PR #80007)

[Vitaly Buka via cfe-commits]

https://github.com/vitalybuka approved this pull request.

I can not reproduce linux bot issue with the patch.

https://github.com/llvm/llvm-project/pull/80007