[MacPorts] #33649: cgal update 3.9 -> 4.0

[MacPorts]

#33649: cgal update 3.9 -> 4.0
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 Reporter:  mmoll@…             |       Owner:  vince@…           
     Type:  update              |      Status:  new               
 Priority:  Normal              |   Milestone:                    
Component:  ports               |     Version:  2.0.4             
 Keywords:                      |        Port:  cgal              
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 Trivial update. Licensing has changed. Eigen3 is now preferred over some
 other low-level dependencies. See
 http://www.cgal.org/Manual/latest/doc_html/installation_manual/Chapter_installation_manual.html#Section_4

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Ticket URL: <https://trac.macports.org/ticket/33649>
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