[Issue 22430] New: OpenBSD: Add OpenBSD to the timezone unittest

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22430

          Issue ID: 22430
           Summary: OpenBSD: Add OpenBSD to the timezone unittest
           Product: D
           Version: D2
          Hardware: All
                OS: Other
            Status: NEW
          Severity: trivial
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: bcallah at openbsd.org

The unittest in std/datetime/timezone.d needlessly failed because OpenBSD isn't
in the OS list.

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