[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:  request                 |      Status:  new                    
 Priority:  Normal                  |   Milestone:                         
Component:  ports                   |     Version:  1.8.2                  
 Keywords:                          |        Port:  libpng                 
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 Running "port livecheck libpng" reports that libpng has been updated.[BR]]
 For some reason MacPorts seems to be sticking to the "previous" rather
 than "current" series of libpng releases, so the livecheck result of 1.4.0
 rather than 1.2.xx is a little misleading.[[BR]]
 If/when libpng is updated to 1.2.42 (the most current version), please
 improve the livecheck expression to look for releases in the correct
 release series.

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