[MacPorts] #19794: pngpp: update to 0.2.3

[MacPorts]

#19794: pngpp: update to 0.2.3
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 Reporter:  guidolorenz@…               |       Owner:  macports-tickets@…                   
     Type:  update                      |      Status:  new                                  
 Priority:  Normal                      |   Milestone:                                       
Component:  ports                       |     Version:  1.7.1                                
 Keywords:                              |        Port:  pngpp                                
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 A trivial update to the latest version.

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Ticket URL: <http://trac.macports.org/ticket/19794>
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