[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:
 Keywords:                |       Port:  perl5
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 Please add a perl5_18 variant to the perl5 port (added in #39473), until
 we figure out what we're doing with either switching to `port select`
 (#29763) or going back to a single perl port.

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