[MacPorts] #50512: perl5: obsolete subports perl5.16 perl5.18 perl5.20

[MacPorts]

#50512: perl5: obsolete subports perl5.16 perl5.18 perl5.20
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  Reporter:  devans@…     |      Owner:  mojca@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  perl5        |
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Comment (by devans@…):

 As I understand it, we decided to support only the current stable version
 of perl -- currently 5.22.  So under that criterion any older versions
 should be obsoleted.  I expect that perl5.22 will be obsoleted when
 perl5.24 is published and we convert to that stable version.

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Ticket URL: <https://trac.macports.org/ticket/50512#comment:2>
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