[Mapguide-trac] [mapguide-trac] #2792: Allow renderers to build with newer libpng versions

[MapGuide Open Source]

#2792: Allow renderers to build with newer libpng versions
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   Reporter:  jng                |      Owner:  jng
       Type:  task               |     Status:  assigned
   Priority:  low                |  Milestone:  3.3
  Component:  Rendering Service  |    Version:  2.5.0
   Severity:  trivial            |   Keywords:
External ID:                     |
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 Where possible, we should always try to build MapGuide against system
 libraries.

 Currently Renderers requires libpng 1.2.x to build succesfully. For newer
 versions, this doesn't build due to removal of certain null pointer
 typedefs and attempting to access raw `png_struct` members instead of
 trying to use the provided accessor APIs.

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Ticket URL: <https://trac.osgeo.org/mapguide/ticket/2792>
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