[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:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:
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 Ignoring things that are supposed to have the dependencies (like protobuf-
 java or py-protobuf), the following six ports still seem to have protobuf-
 cpp dependencies:

 Direct:

 math/shogun-devel
 graphics/opencv
 games/raceintospace

 Indirect via py27-protobuf:

 science/sumo
 math/caffe
 graphics/MyPaint

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