[MacPorts] #58514: swig: update to 4.0.0

[MacPorts]

#58514: swig: update to 4.0.0
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  Reporter:  luzpaz  |      Owner:  michaelld
      Type:  update  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  swig    |
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Comment (by michaelld):

 I need to update that WIP PR with my efforts. Will do that sooner or
 later; way too much work on my queue right now!

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Ticket URL: <https://trac.macports.org/ticket/58514#comment:3>
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