[Issue 21010] Windows symlinks

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21010

--- Comment #2 from starcanopy <starcanopy at protonmail.com> ---
Adding Windows support to std.file.symlink is mostly done. I just need to get
some clarification about some stuff.
For std.file.readLink, druntime is missing a conversion of Fileapi.h, and this
is the header that declares the function to retrieve the target's path,
GetFinalPathNameByHandle[A|W]. For this issue's resolution, I feel that both
readLink and symlink need to be simultaneously added.

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