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COMP: Use internally consistent zlib

Hans Johnson requested to merge github/fork/hjmjohnson/BuildSingleZLIB into master

The zlib libraries are used by many differnt packages includeing ITKv4, LibArchive, VTK, python, and teem.

This patchset builds a single version of zlib that is mangled with a slicer namespace, and uses that one library for all zlib operation throught the "USE_SYSTEM_ZLIB" options.

The mangling for vtk_zlib is disabled for teem because it is not needed when using the External_zlib build.

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