[MacPorts] #57704: zmq, zmq-devel: Fix C++11 detection issues

[MacPorts]

#57704: zmq, zmq-devel: Fix C++11 detection issues
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  Reporter:  ryandesign      |      Owner:  merijn
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  zmq, zmq-devel  |
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Comment (by ryandesign):

 However, you do want to be careful not to impose a C++11 requirement on
 every port that uses zmq, if that can be avoided.

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Ticket URL: <https://trac.macports.org/ticket/57704#comment:1>
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