[libcxx-commits] [libcxx] Rework Modules CMake to be (more) idiomatic. (PR #84936)

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EricWF wrote:

> Thanks for this improvement. Does the current version still work when using modules from the build directory?

It should. though now the generated cmake lists isn't dependent on LIBCXX_BUILD, and instead just hardcodes all of the paths to the build directory.

Ideally we would just have the user link and build against a system libc++, so all that's needed is `-stdlib=libc++`

https://github.com/llvm/llvm-project/pull/84936