[Mapguide-trac] [mapguide-trac] #2854: Update zlib to 1.2.12

[MapGuide Open Source]

#2854: Update zlib to 1.2.12
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   Reporter:  jng      |      Owner:  jng
       Type:  task     |     Status:  assigned
   Priority:  low      |  Milestone:  4.0
  Component:  General  |    Version:
   Severity:  trivial  |   Keywords:
External ID:           |
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 Update our copies of zlib to 1.2.12 under:

  - Oem/gd/zlib
  - Oem/DWFTK/develop/global/src/dwfcore/zlib

 And fix up affected project files to add any new `.c` files and remove any
 non-existent `.c` files
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Ticket URL: <https://trac.osgeo.org/mapguide/ticket/2854>
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