[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:  new                    
 Priority:  Normal                  |   Milestone:                         
Component:  ports                   |     Version:                         
 Keywords:                          |        Port:  libpng                 
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Old description:

> 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.

New description:

 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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Comment(by blb@…):

 I'm guessing the update (from the
 [http://www.libpng.org/pub/png/src/libpng-1.4.0-README.txt ReadMe])

   Enabled iTXt support (changes png_struct, thus requires so-number
 change)

 means all dependents will need a rev-bump, like for jpeg.

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Ticket URL: <http://trac.macports.org/ticket/23125#comment:2>
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