[MacPorts] #56369: github portgroup: don't override an already-specified version

[MacPorts]

#56369: github portgroup: don't override an already-specified version
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign):

 Many do. Many don't. I'm pretty sure we said many years ago that `.setup`
 procedures are bad, and that it's better to just specify things directly,
 which is why the python and php portgroups were then designed that way,
 without `.setup` procedures.

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Ticket URL: <https://trac.macports.org/ticket/56369#comment:3>
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