[MacPorts] #52598: nfdump @1.6.6: update to version 1.6.15

[MacPorts]

#52598: nfdump @1.6.6: update to version 1.6.15
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 Reporter:  allan.que@…  |      Owner:  macports-tickets@…
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  nfdump
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 * updated Portfile to the latest upstream stable version
 * fixed whitespace/indentation
 * moved to using GitHub following upstream

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Ticket URL: <https://trac.macports.org/ticket/52598>
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