Libstdc++ questions regarding Windows symlink patch

[Adam Wood]

Hello,

I have a couple questions regarding my patch titled "Add symlink support on
Windows".

First, who should I ask to review the Windows API parts of the patch?

Second, I am not sure that the approach I took regarding path normalization
was correct. Windows will normalize paths with dot-dots before checking if
the parent directory existed or was a symlink. For example, if you had the
path "folder/doesntexist/.." on Linux, this is an error. Windows doesn't
care about the non-existent folder, and the path is resolved to just
"folder".

I tried to circumvent this behavior in my patch so that functions like
std::filesystem::canonical acted more like Linux so "folder/doesntexist/.."
would throw an error on Windows as well. I now think I was wrong to do
this. What are your thoughts?
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