[Issue 16487] Add function to obtain the available disk space

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16487

--- Comment #1 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> ---
NTFS supports symbolic links too, so GetDiskFreeSpaceExW should receive the
folder path because it can reside on a different partition than the disk it's
accessed through.

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