[MacPorts] #42192: glibmm: Switch to perl 5.16

[MacPorts]

#42192: glibmm: Switch to perl 5.16
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  Reporter:  macsforever2000@…  |      Owner:  devans@…
      Type:  enhancement        |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  glibmm             |
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Comment (by macsforever2000@…):

 I'm happy to make the change if it's alright with you.

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Ticket URL: <https://trac.macports.org/ticket/42192#comment:1>
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