[tor-bugs] #20980 [Core Tor/Tor]: Use the standard OpenBSD preprocessor definition

[Tor Bug Tracker & Wiki]

#20980: Use the standard OpenBSD preprocessor definition
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     Reporter:  cypherpunks   |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 A few places uses `OPENBSD` instead of the typical `__OpenBSD__`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20980>
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