[MacPorts] #34640: lang/perl5: add perl5_16 variant

[MacPorts]

#34640: lang/perl5: add perl5_16 variant
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 Reporter:  pixilla@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement           |      Status:  new                                  
 Priority:  Normal                |   Milestone:                                       
Component:  ports                 |     Version:  2.1.1                                
 Keywords:  haspatch              |        Port:  perl5                                
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Comment(by pixilla@…):

 See r93583, r93584 and #34570

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Ticket URL: <https://trac.macports.org/ticket/34640#comment:2>
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