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Update vtkzlib from zlib 1.2.3 to 1.2.8.

David Gobbi requested to merge dgobbi/vtk:zlib-1.2.8 into master

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:

  1. the header file vtk_zlib_mangle.h is gone, because zlib-1.2.8 provides its own symbol mangling facilities,

  2. the zlibDllConfig.h header has been replaced by vtkzlibConfig.h, which provides additional configuration,

  3. the zlib.def file is gone, because zlib now provides dllimport and dllexport,

  4. the CMakeLists.txt file is now derived from zlib's own CMakeLists.txt file.

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