[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 ryandesign@…):

 I think we'll just update to 1.4.0 and revbump all dependents. When doing
 so, remember to revbump and [ticket:23683 add libpng dependencies to the
 wine ports]. Probably want to also "otool -L" all my installed ports
 afterward to see which ones still link with libpng12.dylib without
 declaring a dependency, so they can be revbumped too and have the
 dependency added.

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Ticket URL: <http://trac.macports.org/ticket/23125#comment:7>
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