[MacPorts] #55684: swi-prolog @7.6.3: update to 7.6.4

[MacPorts]

#55684: swi-prolog @7.6.3: update to 7.6.4
---------------------------------+------------------------
 Reporter:  pmoura               |      Owner:
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:  haspatch maintainer  |       Port:  swi-prolog
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 Update the swi-prolog portfile for the latest release.

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Ticket URL: <https://trac.macports.org/ticket/55684>
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