[MacPorts] #61120: swig: remove dependency on swig3, swig3-${lang}

[MacPorts]

#61120: swig: remove dependency on swig3, swig3-${lang}
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 Reporter:  mohd-akram  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  swig
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 Not sure if these are still required, but there's a comment that says that
 they aren't.

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Ticket URL: <https://trac.macports.org/ticket/61120>
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