[MacPorts] #54000: swi-prolog at 7.4.1: update to 7.4.2

[MacPorts]

#54000: swi-prolog at 7.4.1: update to 7.4.2
---------------------------------+------------------------
 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-prologportfile for the latest release.

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Ticket URL: <https://trac.macports.org/ticket/54000>
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