[MacPorts] #56185: npth requires unnamed semaphores; provide those for Darwin 9 and earlier

[MacPorts]

#56185: npth requires unnamed semaphores; provide those for Darwin 9 and earlier
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  Reporter:  ccorn   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  npth    |
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Comment (by ballapete):

 I created a new ticket, #61115, that requests an enhancement of `npth`
 (and potentially `gnupg2` because it builds but is useless and does not
 work and since it substitutes `gnupg` the user has no working GnuPG
 implementation installed, except when from a third party).

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Ticket URL: <https://trac.macports.org/ticket/56185#comment:4>
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