[MacPorts] #15712: Add versions to platforms

[MacPorts]

#15712: Add versions to platforms
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  Reporter:  raimue       |      Owner:  larryv
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:  MacPorts 2.6.0
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ctreleaven):

 To implement this, is the idea to have a new phase (maybe "check") that is
 evaluated before the fetch phase?

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Ticket URL: <https://trac.macports.org/ticket/15712#comment:16>
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