[MacPorts] #35664: lensfun: update to 0.2.6

[MacPorts]

#35664: lensfun: update to 0.2.6
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  julians37@…        
     Type:  defect                   |      Status:  new                
 Priority:  Normal                   |   Milestone:                     
Component:  ports                    |     Version:  2.1.2              
 Keywords:  haspatch                 |        Port:  lensfun            
-------------------------------------+--------------------------------------
 This patch updates lensfun to 0.2.6, uses a bz2 distfile, uses more modern
 checksum types, adds a gccmakedep dependency, and ensures we're
 UsingTheRightCompiler.

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Ticket URL: <https://trac.macports.org/ticket/35664>
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