[MacPorts] #55650: Update protobuf3-cpp to version 3.5.1

[MacPorts]

#55650: Update protobuf3-cpp to version 3.5.1
---------------------------------+---------------------------
 Reporter:  MarcusCalhoun-Lopez  |      Owner:  blair@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:  haspatch             |       Port:  protobuf3-cpp
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 Attached is a proposed patch to update protobuf3-cpp to the latest
 version.

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Ticket URL: <https://trac.macports.org/ticket/55650>
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