[libcxx-commits] [libcxx] [libc++] Properly guard std::filesystem with >= C++17 (PR #72701)

[via libcxx-commits]

EricWF wrote:

I believe this was to allow C++17 symbols to appear when C++17 wasn't always available. I'm fine getting rid of it without deprecation. 

Let's not teach people to touch our private parts.

https://github.com/llvm/llvm-project/pull/72701