[MacPorts] #60124: swi-prolog-devel @8.1.22: swipl executable remains running after port installs

[MacPorts]

#60124: swi-prolog-devel @8.1.22: swipl executable remains running after port
installs
------------------------+------------------------------
 Reporter:  ryandesign  |      Owner:  J.Wielemaker@…
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  swi-prolog-devel
------------------------+------------------------------
 An `swipl` executable consuming 100% of one CPU core remained running on
 each buildbot worker machine for days after the swi-prolog-devel port was
 recently updated to version 8.1.22, until I noticed it just now and killed
 it.

 I don't know if the same would happen for the swi-prolog @8.0.2 port.

 Please ensure this is fixed so that our limited server resources are not
 wasted.

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Ticket URL: <https://trac.macports.org/ticket/60124>
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