[libcxx-commits] [libcxx] [libc++] Reintroduce LIBCXX_ENABLE_FSTREAM for independent fstream support (PR #193453)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 requested changes to this pull request.

I continue to not be convinced there can be no filesystem if files can be opened.

https://github.com/llvm/llvm-project/pull/193453