[MacPorts] #42189: git-core: update perl variants

[MacPorts]

#42189: git-core: update perl variants
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 Reporter:  jmr@…        |      Owner:  ciserlohn@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  git-core
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 Attached patch adds a perl5_18 variant and changes the default to
 perl5_16.

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Ticket URL: <https://trac.macports.org/ticket/42189>
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