[libcxx-commits] [libcxx] [libc++] Make __config_site modular (PR #135432)

[Ian Anderson via libcxx-commits]

ian-twilightcoder wrote:

Plain rebase of https://github.com/llvm/llvm-project/pull/134699 with no other changes, I'm not sure why GitHub doesn't think it can merge that one 🤷‍♂️ 

https://github.com/llvm/llvm-project/pull/135432