[MacPorts] #46749: mod_perl2: add variants +perl5_18 +perl5_20

[MacPorts]

#46749: mod_perl2:  add variants +perl5_18 +perl5_20
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  Reporter:  devans@…     |      Owner:  ryan@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  mod_perl2    |
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Comment (by mojca@…):

 Should we add `mod_perl` to the list of "affected" ports as well?

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Ticket URL: <https://trac.macports.org/ticket/46749#comment:2>
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