[Issue 12083] std.path.absolutePath doesn't accept mutable strings

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12083

--- Comment #3 from hsteoh at quickfur.ath.cx ---
Ultimately, this is caused by buildPath() always returning immutable, even
though there's no reason it has to.

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