[MacPorts] #14128: Updated swi-prolog portfile to version 5.6.50

[MacPorts]

#14128: Updated swi-prolog portfile to version 5.6.50
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  Reporter:  pmoura at logtalk.org  |       Owner:  ryandesign at macports.org
      Type:  enhancement         |      Status:  closed                 
  Priority:  Normal              |   Milestone:  Port Updates           
 Component:  ports               |     Version:  1.6.0                  
Resolution:  fixed               |    Keywords:                         
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Changes (by ryandesign at macports.org):

  * type:  defect => enhancement

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14128#comment:3>
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