[MacPorts] #56482: py-protobuf3: Use cxx11 1.1 portgroup

[MacPorts]

#56482: py-protobuf3: Use cxx11 1.1 portgroup
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  Reporter:  ryandesign    |      Owner:  kencu
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  py-protobuf3  |
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Comment (by kencu):

 This looks relevant: <https://github.com/google/protobuf/issues/3905>

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Ticket URL: <https://trac.macports.org/ticket/56482#comment:2>
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