[MacPorts] #41501: swi-prolog @6.4.1: update to 6.6.0

[MacPorts]

#41501: swi-prolog @6.4.1: update to 6.6.0
---------------------------------+--------------------------------
 Reporter:  pmoura@…             |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  swi-prolog
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 Update swi-prolog portfile to the latest release.

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Ticket URL: <https://trac.macports.org/ticket/41501>
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