[MacPorts] #57875: port:poppler shouldn't require C++14?!

[MacPorts]

#57875: port:poppler shouldn't require C++14?!
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  Reporter:  RJVB     |      Owner:  dbevans
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  poppler  |
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Comment (by sharris40):

 It's not required for thread_local; it's required for make_unique. It may
 work fine for you, but make_unique is not part of C++11, and it will not
 work on every C++11 compiler.

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Ticket URL: <https://trac.macports.org/ticket/57875#comment:2>
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