[MacPorts] #64695: freeciv @2.6.4_0: upgrade to 3.0.0

[MacPorts]

#64695: freeciv @2.6.4_0: upgrade to 3.0.0
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  Reporter:  DDeanBrown  |      Owner:  JDLH (Jim DeLaHunt)
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  freeciv     |
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Comment (by JDLH):

 I intend to pick up this new version in the course of a major restructure
 to the port, as described in #62984 . Thus if someone wants to update the
 existing port with the version 3.0.0 code, go for it. But I expect to come
 along, eventually, with the new port file and 2.6.6 (as in #63141),
 followed shortly by 3.0.0.

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Ticket URL: <https://trac.macports.org/ticket/64695#comment:3>
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