[MacPorts] #38861: update cgal to version 4.2

[MacPorts]

#38861: update cgal to version 4.2
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  Reporter:  mmoll@…  |      Owner:  vince@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.1.3
Resolution:           |   Keywords:
      Port:  cgal     |
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Comment (by mmoll@…):

 Perhaps the demos that depend on ipe can be disabled? IIRC, only few demos
 depend on it.

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Ticket URL: <https://trac.macports.org/ticket/38861#comment:2>
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