[MacPorts] #28573: fltk-devel update, fix universal build

[MacPorts]

#28573: fltk-devel update, fix universal build
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 Reporter:  jarno.rajahalme@…        |       Owner:  macports-tickets@…                   
     Type:  update                   |      Status:  new                                  
 Priority:  Normal                   |   Milestone:                                       
Component:  ports                    |     Version:  1.9.2                                
 Keywords:                           |        Port:  fltk-devel                           
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Comment(by michaelld@…):

 Thank you for the update on fltk.  Your changes -almost- work; I'll check-
 in an update as soon as I've tested everything.

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Ticket URL: <https://trac.macports.org/ticket/28573#comment:3>
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