[MacPorts] #31556: Update Fluxbox to 1.3.1

[MacPorts]

#31556: Update Fluxbox to 1.3.1
------------------------------+---------------------------------------------
 Reporter:  cal@…             |       Owner:  pmq@…           
     Type:  defect            |      Status:  new             
 Priority:  Normal            |   Milestone:                  
Component:  ports             |     Version:  2.0.99          
 Keywords:  haspatch          |        Port:  fluxbox         
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 The attached patch updates the Fluxbox port to version 1.3.1.

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Ticket URL: <https://trac.macports.org/ticket/31556>
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