[MacPorts] #35952: camlimages: build fails with libpng 1.5

[MacPorts]

#35952: camlimages: build fails with libpng 1.5
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 Reporter:  fu7mu4@…          |       Owner:  reilles@…       
     Type:  defect            |      Status:  new             
 Priority:  Normal            |   Milestone:                  
Component:  ports             |     Version:  2.1.2           
 Keywords:                    |        Port:  camlimages      
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Comment(by fu7mu4@…):

 camlimages 4.0.1_4 is released, but its build is failed again.

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Ticket URL: <https://trac.macports.org/ticket/35952#comment:3>
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