[Issue 22738] New: std.file.tempDir adds an addition / even when it already has one

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22738

          Issue ID: 22738
           Summary: std.file.tempDir adds an addition / even when it
                    already has one
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Mac OS X
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: alphaglosined at gmail.com

In #17488 it was introduced that tempDir would add an additional forward slash
on POSIX regardless of it already having it.

As a result, this has broken dub's CI (easily worked around however).

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