[MacPorts] #57117: upgrade last users of protobuf-cpp to protobuf3-cpp

[MacPorts]

#57117: upgrade last users of protobuf-cpp to protobuf3-cpp
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  Reporter:  pmetzger                            |      Owner:  (none)
      Type:  enhancement                         |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  caffe MyPaint opencv raceintospace  |
  shogun-devel sumo                              |
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Comment (by mojca):

 That won't be a completely fool-proof solution either. While `pkg-config`
 may return `-std=c++11`, it won't be able to tell MacPorts that some
 compilers need to be blacklisted.

 (I did this in the wxWidgets PortGroup, but it's probably not worth
 creating a PortGroup in this case.)

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Ticket URL: <https://trac.macports.org/ticket/57117#comment:12>
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