[MacPorts] #29084: octave-image 1.0.10 won't build with libpng 1.4

[MacPorts]

#29084: octave-image 1.0.10 won't build with libpng 1.4
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 Reporter:  ken.gregson@…          |       Owner:  ryandesign@…           
     Type:  defect                 |      Status:  assigned               
 Priority:  Normal                 |   Milestone:                         
Component:  ports                  |     Version:  1.9.2                  
 Keywords:  png                    |        Port:  octave-image           
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Comment(by ryandesign@…):

 Between 1.0.10 and 1.0.13 they removed the configure script, making this
 update harder than I anticipated.

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Ticket URL: <https://trac.macports.org/ticket/29084#comment:3>
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