[MacPorts] #23125: graphics/libpng update version, tweak livecheck

[MacPorts]

#23125: graphics/libpng update version, tweak livecheck
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 Reporter:  rmsfisher@…             |       Owner:  ryandesign@…           
     Type:  update                  |      Status:  assigned               
 Priority:  Normal                  |   Milestone:                         
Component:  ports                   |     Version:                         
 Keywords:                          |        Port:  libpng                 
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Comment(by jmr@…):

 Here's a patch that updates libpng to 1.4.1 and adds a new non-conflicting
 libpng12 port based on the old version. Also removes muniversal because it
 is doing nothing useful (the configured source for each arch does not
 differ at all apart from the arch flags).

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Ticket URL: <http://trac.macports.org/ticket/23125#comment:8>
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