[MacPorts] #48333: nettle: update to 3.1.1

[MacPorts]

#48333: nettle: update to 3.1.1
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  Reporter:  ryandesign@…  |      Owner:  ryandesign@…
      Type:  update        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:
      Port:  nettle        |
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Comment (by ionic@…):

 Note that ports that also depend on nettle and are not yet
 version-3-compatible will break without any means of fixing them properly
 (short of searching for patches in upstream bug trackers.)

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Ticket URL: <https://trac.macports.org/ticket/48333#comment:2>
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