Source: http://zlib.net/
Current release: zlib 1.2.8 April 28, 2013.
Update note: not all files included in zlib are also included in FLTK's
zlib version. However, there are only two files that are different from
the original zlib versions:
- zlib/CMakeLists.txt
- zlib/Makefile
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10624 ea41ed52-d2ee-0310-a9c1-e6b18d33e121