[MacPorts] #30250: upgrade mapserver to version 6.0

[MacPorts]

#30250: upgrade mapserver to version 6.0
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 Reporter:  thomas.bonfort@…          |       Owner:  mbarchfe@…             
     Type:  update                    |      Status:  new                    
 Priority:  Normal                    |   Milestone:                         
Component:  ports                     |     Version:                         
 Keywords:  haspatch                  |        Port:  mapserver              
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Comment(by thomas.bonfort@…):

 attached a new patch that superceeds the previous one:

  * adds variants: gdal, ogr, postgis, wms, wfs, wfsclient, wmsclient, wcs,
 sos, fastcgi, kml
  * two new Portfiles: mapserver60 and mapserver56 for versions 6.0 and 5.6
  * removes the old mapserver port (replaced_by mapserver56)
  * better postgresql detection, by looking for pg_config instead of
 requiring a specific variant

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Ticket URL: <https://trac.macports.org/ticket/30250#comment:4>
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