[MacPorts] #68287: py310-poppler-qt5 fails with sonoma and xcode15

[MacPorts]

#68287: py310-poppler-qt5 fails with sonoma and xcode15
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  Reporter:  MStraeten          |      Owner:  dliessi
      Type:  defect             |     Status:  assigned
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.8.1
Resolution:                     |   Keywords:  xcode15,
      Port:  py310-poppler-qt5  |
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Comment (by chrstphrchvz):

 `std::optional` requires C++17, but `-std=gnu++11` is being specified to
 compiler (by qmake, I believe).

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Ticket URL: <https://trac.macports.org/ticket/68287#comment:2>
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