[libcxx-commits] [libcxx] [libcxx] Fix include directory order (PR #65859)

[Petr Hosek via libcxx-commits]

petrhosek wrote:

This is only an issue on Darwin; on other platforms we install the target specific files such as `__config_site` into the per-target directory, i.e. `include/<target>/c++/v1/__config_site`, but on Darwin there is no per-target directory because Darwin supports multiple targets with a single set of files so `__config_site` is installed in `include/c++/v1/__config_site`.

https://github.com/llvm/llvm-project/pull/65859