[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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Comment(by pmoura@…):

 That line is taken from the SWI-Prolog developer instructions for Mac OS
 X. I'm not familiar with PKG_CONFIG. Tested the patch before submitting.
 Everything seems fine. Your suggested alternative would be?

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Ticket URL: <https://trac.macports.org/ticket/33423#comment:2>
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