[MacPorts] #15673: Updated portfile for swi-prolog 5.6.56

[MacPorts]

#15673: Updated portfile for swi-prolog 5.6.56
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 Reporter:  pmoura at logtalk.org  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  defect              |      Status:  new                                  
 Priority:  Normal              |   Milestone:  Port Updates                         
Component:  ports               |     Version:  1.6.0                                
 Keywords:                      |  
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 Updated portfile for swi-prolog 5.6.56.

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Ticket URL: <http://trac.macports.org/ticket/15673>
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