[MacPorts] #26566: Updated swi-prolog-devel portfile for version 5.11.6

[MacPorts]

#26566: Updated swi-prolog-devel portfile for version 5.11.6
---------------------------------+------------------------------------------
 Reporter:  pmoura@…             |       Owner:  ryandesign@…           
     Type:  update               |      Status:  assigned               
 Priority:  Normal               |   Milestone:                         
Component:  ports                |     Version:  1.9.1                  
 Keywords:  haspatch maintainer  |        Port:  swi-prolog-devel       
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Comment(by ryandesign@…):

 Guess I'll have to wait a bit to test and commit this update; the server
 isn't letting me have the distfile (or anything else):

 > Service Temporarily Unavailable [[br]]
 >  [[br]]
 > The server is temporarily unable to service your request due to
 maintenance downtime or capacity problems. Please try again later. [[br]]
 >  [[br]]
 > Apache/2.2.9 (Debian) mod_jk/1.2.26 PHP/5.2.6-1+lenny8 with Suhosin-
 Patch proxy_html/3.0.0 Server at www.swi-prolog.org Port 80

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Ticket URL: <https://trac.macports.org/ticket/26566#comment:2>
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