[MacPorts] #57178: pinentry-mac fails to compile with Xcode 10

[MacPorts]

#57178: pinentry-mac fails to compile with Xcode 10
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  Reporter:  pmetzger      |      Owner:  Ionic
      Type:  defect        |     Status:  assigned
  Priority:  High          |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  xcode10
      Port:  pinentry-mac  |
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Comment (by pmetzger):

 Sort of. We might want a distinct ticket to track the overall problem,
 which has hit other ports too.

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Ticket URL: <https://trac.macports.org/ticket/57178#comment:15>
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