[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 would prefer to handle this upgrade in the more traditional way: update
 the libpng port to 1.4.x, revbump all ports that use libpng, and later, if
 needed, add a libpng12 port for those ports that are incompatible with
 libpng 1.4.x. This way we can be sure which ports are linking with which
 version of libpng.

 While Joshua's proposal might seem to be smoother, I worry that it means
 that ports built before this change will be using libpng 1.2.x, but
 rebuilding those ports would probably re-link them with libpng 1.4.x,
 possibly causing problems or incompatibilities then. We won't know until
 such a rebuild happens. I'd kind of rather have all those rebuilds happen
 now, via a revbump, and get it all out of the way.

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Ticket URL: <http://trac.macports.org/ticket/23125#comment:14>
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