[MacPorts] #68731: pinentry-mac does not build with Xcode 15

[MacPorts]

#68731: pinentry-mac does not build with Xcode 15
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 Reporter:  szhorvat  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  pinentry-mac
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 pinentry-mac does not build on my macOS 13.6 system, probably because I
 have Xcode 15. Log file is attached. `gnupg2` depends on this port, and
 lots of other ports depend on `gnupg2`.

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Ticket URL: <https://trac.macports.org/ticket/68731>
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