[MacPorts] #35995: enblend: build error with libpng 1.5

[MacPorts]

#35995: enblend: build error with libpng 1.5
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 Reporter:  raphael@…             |       Owner:  hvdwolf@…        
     Type:  defect                |      Status:  new              
 Priority:  Normal                |   Milestone:                   
Component:  ports                 |     Version:                   
 Keywords:  haspatch              |        Port:  enblend          
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 Enblend fails to build with libpng 1.5. The attached patch, which is
 derived from an
 [http://enblend.hg.sourceforge.net/hgweb/enblend/enblend/rev/101796703d73
 upstream changeset], fixes the problem.

 May I commit it?

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Ticket URL: <https://trac.macports.org/ticket/35995>
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