[MacPorts] #47218: protobuf3-cpp: update to 3.0.0-alpha-2

[MacPorts]

#47218: protobuf3-cpp: update to 3.0.0-alpha-2
----------------------------+----------------------
  Reporter:  ryandesign     |      Owner:  blair
      Type:  update         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.3.99
Resolution:  duplicate      |   Keywords:  haspatch
      Port:  protobuf3-cpp  |
----------------------------+----------------------
Changes (by ryandesign):

 * status:  new => closed
 * resolution:   => duplicate


Comment:

 Superseded by #54136.

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Ticket URL: <https://trac.macports.org/ticket/47218#comment:4>
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