[MacPorts] #56432: MyPaint, MyPaint-devel: use protobuf3-cpp

[MacPorts]

#56432: MyPaint, MyPaint-devel: use protobuf3-cpp
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  Reporter:  pmetzger     |      Owner:  ryandesign
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  MyPaint      |
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Comment (by ryandesign):

 I set them to openmaintainer. If someone else wants to take over, that's
 fine too.

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Ticket URL: <https://trac.macports.org/ticket/56432#comment:4>
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