[MacPorts] #35803: lensfun: update to 0.2.6 for libpng15 compatibility

[MacPorts]

#35803: lensfun: update to 0.2.6 for libpng15 compatibility
------------------------------+---------------------------------------------
 Reporter:  cal@…             |       Owner:  julians37@…        
     Type:  defect            |      Status:  new                
 Priority:  Normal            |   Milestone:                     
Component:  ports             |     Version:  2.1.2              
 Keywords:                    |        Port:  lensfun            
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 Lensfun 0.2.5 fails to build against libpng15. Updating to 0.2.6 fixes
 this. I'm attaching a patch against the Portfile that will update lensfun
 to 0.2.6.

 Please give permission to update lensfun.

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Ticket URL: <https://trac.macports.org/ticket/35803>
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