[MacPorts] #66069: doxygen @1.9.5 upgrade failure on 10.13.6: error: call to unavailable function 'get': introduced in macOS 10.14

[MacPorts]

#66069: doxygen @1.9.5 upgrade failure on 10.13.6: error: call to unavailable
function 'get': introduced in macOS 10.14
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  Reporter:  rufty    |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.0
Resolution:           |   Keywords:
      Port:  doxygen  |
----------------------+--------------------

Comment (by jmroot):

 Needs to require C++17 at the very least. See previous issues with 1.9.4
 in #65314.

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Ticket URL: <https://trac.macports.org/ticket/66069#comment:2>
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