[MacPorts] #39750: nettle @2.6: update to 2.7.1

[MacPorts]

#39750: nettle @2.6: update to 2.7.1
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  Reporter:  macports@…  |      Owner:  exodusd@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  nettle      |
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Comment (by frederic.devernay@…):

 This also fixes the universal build (#38883), without modification

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Ticket URL: <https://trac.macports.org/ticket/39750#comment:2>
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