Update vtkzlib from zlib 1.2.3 to 1.2.8.
The following package was downloaded from http://www.zlib.net:
md5sum 44d667c142d7cda120332623eab69f40 zlib-1.2.8.tar.gz
For additional verification, the sha256 of this file was:
36658cb768a54c1d4dec43c3116c27ed893e88b02ecfcb44f2166f9c0b7f2a0d
See README.Kitware.txt for the list of files.
This new version of zlib provides security fixes and simplifies compressed stream I/O. With this update, the following changes have been made to the way VTK builds vtkzlib:
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the header file vtk_zlib_mangle.h is gone, because zlib-1.2.8 provides its own symbol mangling facilities,
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the zlibDllConfig.h header has been replaced by vtkzlibConfig.h, which provides additional configuration,
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the zlib.def file is gone, because zlib now provides dllimport and dllexport,
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the CMakeLists.txt file is now derived from zlib's own CMakeLists.txt file.