[MacPorts] #28183: libpng upgrade to 1.4 breaks pngmeta

[MacPorts]

#28183: libpng upgrade to 1.4 breaks pngmeta
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 Reporter:  vinc17@…             |       Owner:  ryandesign@…           
     Type:  defect               |      Status:  new                    
 Priority:  High                 |   Milestone:                         
Component:  ports                |     Version:  1.9.2                  
 Keywords:                       |        Port:  libpng pngmeta         
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 pngmeta doesn't seem to be compatible with libpng 1.4:
 {{{
 pngmeta.c: In function 'png_skip_till_end':
 pngmeta.c:117: warning: 'idat_size' is deprecated (declared at
 /opt/local/include/png.h:1199)
 pngmeta.c:128: warning: 'chunk_name' is deprecated (declared at
 /opt/local/include/png.h:1205)
 pngmeta.c:129: warning: 'chunk_name' is deprecated (declared at
 /opt/local/include/png.h:1205)
 pngmeta.c:129: error: 'png_IDAT' undeclared (first use in this function)
 pngmeta.c:129: error: (Each undeclared identifier is reported only once
 pngmeta.c:129: error: for each function it appears in.)
 [... lots of warnings about deprecated identifiers ...]
 }}}
 Please revert to libpng 1.2 or add a new libpng12 port. Alternatively
 remove pngmeta (it seems that exiftool can be used instead).

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Ticket URL: <https://trac.macports.org/ticket/28183>
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