[MacPorts] #54928: webkit2-gtk @2.14.2: build failing under High Sierra due to error: delegating constructors are permitted only in C++11

[MacPorts]

#54928: webkit2-gtk @2.14.2: build failing under High Sierra due to error:
delegating constructors are permitted only in C++11
--------------------------+------------------------
  Reporter:  pmetzger     |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  highsierra
      Port:  webkit2-gtk  |
--------------------------+------------------------

Comment (by pmetzger):

 Succeeded just fine under High Sierra given the `configure.cxxflags-append
 -std=c++14` setting.

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Ticket URL: <https://trac.macports.org/ticket/54928#comment:8>
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