[MacPorts] #51453: Update CImg to 1.7.1

[MacPorts]

#51453: Update CImg to 1.7.1
---------------------+--------------------------------
  Reporter:  bstj@…  |      Owner:  macports-tickets@…
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  patch
      Port:  CImg    |
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Changes (by khindenburg@…):

 * keywords:   => patch
 * version:  2.3.4 =>


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Ticket URL: <https://trac.macports.org/ticket/51453#comment:1>
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