[Issue 23498] New: OpenBSD: Fix core.sys.posix.sys.wait

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23498

          Issue ID: 23498
           Summary: OpenBSD: Fix core.sys.posix.sys.wait
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: bcallah at openbsd.org

OpenBSD does define WSTOPPED and WNOWAIT, despite what the comment says.
Also, I forgot to add the idtype_t enum. Found the hard way.

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