[MacPorts] #31562: CGAL version bump 3.8 -> 3.9

[MacPorts]

#31562: CGAL version bump 3.8 -> 3.9
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  Reporter:  mmoll@…             |       Owner:  vince@…           
      Type:  update              |      Status:  reopened          
  Priority:  Normal              |   Milestone:                    
 Component:  ports               |     Version:                    
Resolution:                      |    Keywords:  haspatch          
      Port:  cgal                |  
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Comment(by ryandesign@…):

 You're right, I didn't address that part of the request. Deactivate cgal
 3.8 before trying to build 3.9. I'll add a check to the portfile to make
 sure users do that.

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Ticket URL: <https://trac.macports.org/ticket/31562#comment:8>
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