[MacPorts] #59953: grass7 +python34 depends on nonexistent ports

[MacPorts]

#59953: grass7 +python34 depends on nonexistent ports
-------------------------+--------------------
  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  grass7      |
-------------------------+--------------------

Comment (by nilason):

 I believe the python34 variant can be removed, this is suggested by PR
 https://github.com/macports/macports-ports/pull/7038.

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Ticket URL: <https://trac.macports.org/ticket/59953#comment:1>
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