[Bug libstdc++/97813] std::filesystem::equivalent returning incorrect results on MinGW due to symlinks

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97813

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For example, filesystem::is_symlink doesn't work on Windows, and
create_symlink, and create_directory_symlink etc. etc.

So we could make equivalent work, but that's just a small part of what's
missing.