[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):

 Replying to [comment:5 ryandesign]:
 > Should this be added to our legacy support library instead?

 The C files, that might be a splendid idea. This way a few ports could use
 a uniform legacy support instead of individual solutions for unnamed
 (therefore safer?) semaphores. **My** wish is that `npth` is enhanced soon
 that `GnuPG 2` can be used on older systems. As I mention in #61115 there
 can be a number of users that have installed `GnuPG 2` and have now an
 unusable software. I found this by trying to use `GnuPG 2` – and it failed
 completely and I did not understand why. It took a long time until I found
 this explanatory ticket…

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Ticket URL: <https://trac.macports.org/ticket/56185#comment:6>
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