[MacPorts] #33423: Updated swi-prolog portfile for version 6.0.1

[MacPorts]

#33423: Updated swi-prolog portfile for version 6.0.1
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 Reporter:  pmoura@…             |       Owner:  cal@…           
     Type:  update               |      Status:  assigned        
 Priority:  Normal               |   Milestone:                  
Component:  ports                |     Version:  2.0.4           
 Keywords:  haspatch maintainer  |        Port:  swi-prolog      
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Changes (by cal@…):

  * status:  new => assigned
  * owner:  macports-tickets@… => cal@…


Comment:

 Can you elaborate on why `PKG_CONFIG_PATH=/usr/X11R6/lib/pkgconfig` is
 needed? We usually don't link against system X11 libs in MacPorts, but
 rather depend on and link against the appropriate `xorg-*` port. See
 wiki:FAQ#ownlibs.

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Ticket URL: <https://trac.macports.org/ticket/33423#comment:1>
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