[MacPorts] #44760: swi-prolog-devel @7.1.19: update to 7.1.21

[MacPorts]

#44760: swi-prolog-devel @7.1.19: update to 7.1.21
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 Reporter:  pmoura@…             |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.1
 Keywords:  haspatch maintainer  |       Port:  swi-prolog-devel
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Ticket URL: <https://trac.macports.org/ticket/44760>
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