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

[MacPorts]

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

Comment (by pmetzger):

 Frank, thanks for that edit, it's easier to look at now!

-- 
Ticket URL: <https://trac.macports.org/ticket/57117#comment:3>
MacPorts <https://www.macports.org/>
Ports system for macOS