[Issue 22454] New: OpenBSD: Add prototypes for pthread_np.h

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22454

          Issue ID: 22454
           Summary: OpenBSD: Add prototypes for pthread_np.h
           Product: D
           Version: D2
          Hardware: All
                OS: Other
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: bcallah at openbsd.org

FreeBSD and DragonFly BSD have a pthread_np.d filled with prototypes from
pthread_np.h

Do the same for OpenBSD.

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