[MacPorts] #41160: perl5: add perl5_18 variant

[MacPorts]

#41160: perl5: add perl5_18 variant
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  Reporter:  ryandesign@…  |      Owner:  mcalhoun@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch
      Port:  perl5         |
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Comment (by jmr@…):

 r116111 (Note the patch on this ticket doesn't add the needed new
 conflicts to the existing variants)

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Ticket URL: <https://trac.macports.org/ticket/41160#comment:6>
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