[MacPorts] #28385: graphics/libpng upgrade version to 1.5.1

[MacPorts]

#28385: graphics/libpng upgrade version to 1.5.1
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 Reporter:  rmstonecipher@…             |       Owner:  rmstonecipher@…           
     Type:  update                      |      Status:  new                       
 Priority:  Normal                      |   Milestone:                            
Component:  ports                       |     Version:  1.9.2                     
 Keywords:                              |        Port:  libpng                    
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Comment(by suv-sf@…):

 MyPaint  - still hasn't been revbumped since the upgrade to libpng 1.4.5 -
 see [comment:ticket:28078:10 earlier comment]

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Ticket URL: <https://trac.macports.org/ticket/28385#comment:2>
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