[Issue 22485] New: OpenBSD: Fix core.sys.openbsd.unistd imports

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22485

          Issue ID: 22485
           Summary: OpenBSD: Fix core.sys.openbsd.unistd imports
           Product: D
           Version: D2
          Hardware: All
                OS: Other
            Status: NEW
          Severity: trivial
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: bcallah at openbsd.org

This one is my fault. The public import core.sys.posix.unistd; in
core.sys.openbsd.unistd ends up breaking code that should otherwise work.

Discovered when trying to use core.sys.openbsd.unistd with std.getopt.

The import isn't needed at all.

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