[MacPorts] #29518: Updated swi-prolog-devel portfile for version 5.11.21

[MacPorts]

#29518: Updated swi-prolog-devel portfile for version 5.11.21
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 Reporter:  pmoura@…             |       Owner:  ryandesign@…           
     Type:  update               |      Status:  assigned               
 Priority:  Normal               |   Milestone:                         
Component:  ports                |     Version:  1.9.2                  
 Keywords:  haspatch maintainer  |        Port:  swi-prolog-devel       
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Comment(by pmoura@…):

 Yes. I just checked that the SWI-Prolog developer updated the source
 archive after I submitted the new portfile.

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Ticket URL: <https://trac.macports.org/ticket/29518#comment:2>
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