[MacPorts] #57650: swig-ruby: Add support for ruby25

[MacPorts]

#57650: swig-ruby: Add support for ruby25
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  Reporter:  mouse07410   |      Owner:  michaelld
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  swig-ruby    |
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Comment (by cooljeanius):

 This ought to supersede #53430

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Ticket URL: <https://trac.macports.org/ticket/57650#comment:3>
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