[MacPorts] #53932: libpng @1.6.28: update to 1.6.29

[MacPorts]

#53932: libpng @1.6.28: update to 1.6.29
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 Reporter:  l2dy    |      Owner:  ryandesign
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libpng
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Ticket URL: <https://trac.macports.org/ticket/53932>
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