[MacPorts] #46844: help2man: add support for perl5.{16,18,20}

[MacPorts]

#46844: help2man: add support for perl5.{16,18,20}
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 Reporter:  Mathias.Laurin+macports.org@…  |      Owner:  macports-
     Type:  enhancement                    |  tickets@…
 Priority:  Normal                         |     Status:  new
Component:  ports                          |  Milestone:
 Keywords:                                 |    Version:  2.3.3
                                           |       Port:
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 Summary of the changes:

 - depend on perl5 using "PortGroup perl5"
 - provide branches 5.16 5.18 5.20

 Now, help2man compiles with perl 5.18.

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Ticket URL: <https://trac.macports.org/ticket/46844>
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