[MacPorts] #64629: protozero: Update to 1.7.1

[MacPorts]

#64629: protozero: Update to 1.7.1
------------------------+-----------------------
  Reporter:  SiggyF     |      Owner:  frankdean
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.1
Resolution:             |   Keywords:
      Port:  protozero  |
------------------------+-----------------------

Comment (by frankdean):

 I've submitted PR #13937 to update the version and disable treating
 warnings as errors - https://github.com/macports/macports-ports/pull/13937

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Ticket URL: <https://trac.macports.org/ticket/64629#comment:2>
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