[MacPorts] #30250: upgrade mapserver to version 6.0

[MacPorts]

#30250: upgrade mapserver to version 6.0
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 Reporter:  thomas.bonfort@…          |       Owner:  macports-tickets@…                   
     Type:  defect                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:  1.9.2                                
 Keywords:                            |        Port:  mapserver                            
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 current macports mapserver version is 5.2.0 which is very old.

 attached patch brings support up for version 6.0, along with some more
 detailed configuration options for selecting variants

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Ticket URL: <https://trac.macports.org/ticket/30250>
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