[MacPorts] #28385: libpng: update to 1.5.x

[MacPorts]

#28385: libpng: update to 1.5.x
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 Reporter:  rmstonecipher@…             |       Owner:  rmstonecipher@…           
     Type:  update                      |      Status:  new                       
 Priority:  Normal                      |   Milestone:                            
Component:  ports                       |     Version:                            
 Keywords:  haspatch                    |        Port:  libpng                    
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Comment(by rmstonecipher@…):

 With the addition of rev-upgrade in release 2.1.0, is it still necessary
 to increase the revision of dependent ports?

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Ticket URL: <https://trac.macports.org/ticket/28385#comment:14>
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