[MacPorts] #46756: p5-test-unit: add support for 5.18 5.20 5.22, other minor cleanups

[MacPorts]

#46756: p5-test-unit: add support for 5.18 5.20 5.22, other minor cleanups
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  Reporter:  mojca@…       |      Owner:  blair@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  p5-test-unit  |
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Comment (by blair@…):

 I'm OK with removing it or giving ownership to somebody else, as I don't
 code in perl now.

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Ticket URL: <https://trac.macports.org/ticket/46756#comment:3>
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