Remove builtin copy of zlib

On GNU/Linux, *BSD or MacOS we can simply use the system default
library. The copy was primarily only there for the Windows build.

The build script for Windows has now been adapted to download and
compile a shared library from a tarball.

This removes a huge chunk of code from the git tree as well as
the release tarballs. Additionally it gets rid of iffy things like
removing the Zlib copyright/version strings, so the libsquashfs DLL
doesn't export it.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 0 insertions, 195 deletions

diff --git a/lib/zlib/README b/lib/zlib/README
deleted file mode 100644
index 744553b..0000000
--- a/lib/zlib/README
+++ /dev/null
@@ -1,195 +0,0 @@
-Changes made for inclusion in libsquashfs:
-
-  NOTE: THE SOURCE CODE IN THIS DIRECTORY IS NOT THE ORIGINAL ZLIB
-  SOURCE CODE!
-
-  A number of things were removed for inclusion in libsquashfs, part of the
-  squashfs-tools-ng package.
-
-  The original package that the source code in this directory is based on
-  is the zlib-1.2.12 source tar ball obtained from http://zlib.net/ on
-  March 30, 2022.
-
-  An attempt has been made at removing the entire build system, samples,
-  tests, documentation, 3rd party contributions and various utility functions.
-
-  The following sub-directories were removed with all there contents:
-    amiga/
-    contrib/
-    doc/
-    examples/
-    msdos/
-    nintendods/
-    old/
-    os400/
-    qnx/
-    test/
-    watcom/
-    win32/
-
-  The following source files were removed in their entirety:
-    gzread.c
-    gzclose.c
-    gzwrite.c
-    gzguts.h
-    gzlib.c
-    gzguts.h
-    compress.c
-    uncompr.c
-    infback.c
-
-  The following source files were modified (modifications marked with a
-  comment in the source):
-    zutil.c
-    deflate.c
-    inftrees.c
-    zconf.h
-    zutil.h
-    crc32.c
-
-  The following additional files were removed in their entirety:
-    ChangeLog
-    CMakeLists.txt
-    configure
-    FAQ
-    INDEX
-    Makefile
-    Makefile.in
-    make_vms.com
-    treebuild.xml
-    zconf.h.cmakein
-    zconf.h.in
-    zlib.3
-    zlib.3.pdf
-    zlib.map
-    zlib.pc.cmakein
-    zlib.pc.in
-    zlib2ansi
-
-  The following additional files were modified:
-    README
-
-  A copy of the zlib license is included in licenses/zlib.txt in the root
-  directory of the squashfs-tools-ng source package.
-
-Rest of the original README follows:
--------------------------------------------------------------------------------
-
-ZLIB DATA COMPRESSION LIBRARY
-
-zlib 1.2.12 is a general purpose data compression library.  All the code is
-thread safe.  The data format used by the zlib library is described by RFCs
-(Request for Comments) 1950 to 1952 in the files
-http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
-rfc1952 (gzip format).
-
-All functions of the compression library are documented in the file zlib.h
-(volunteer to write man pages welcome, contact zlib@gzip.org).  A usage example
-of the library is given in the file test/example.c which also tests that
-the library is working correctly.  Another example is given in the file
-test/minigzip.c.  The compression library itself is composed of all source
-files in the root directory.
-
-To compile all files and run the test program, follow the instructions given at
-the top of Makefile.in.  In short "./configure; make test", and if that goes
-well, "make install" should work for most flavors of Unix.  For Windows, use
-one of the special makefiles in win32/ or contrib/vstudio/ .  For VMS, use
-make_vms.com.
-
-Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
-<info@winimage.com> for the Windows DLL version.  The zlib home page is
-http://zlib.net/ .  Before reporting a problem, please check this site to
-verify that you have the latest version of zlib; otherwise get the latest
-version and check whether the problem still exists or not.
-
-PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
-
-Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
-issue of Dr.  Dobb's Journal; a copy of the article is available at
-http://marknelson.us/1997/01/01/zlib-engine/ .
-
-The changes made in version 1.2.12 are documented in the file ChangeLog.
-
-Unsupported third party contributions are provided in directory contrib/ .
-
-zlib is available in Java using the java.util.zip package, documented at
-http://java.sun.com/developer/technicalArticles/Programming/compression/ .
-
-A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
-at CPAN (Comprehensive Perl Archive Network) sites, including
-http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
-
-A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
-available in Python 1.5 and later versions, see
-http://docs.python.org/library/zlib.html .
-
-zlib is built into tcl: http://wiki.tcl.tk/4610 .
-
-An experimental package to read and write files in .zip format, written on top
-of zlib by Gilles Vollant <info@winimage.com>, is available in the
-contrib/minizip directory of zlib.
-
-
-Notes for some targets:
-
-- For Windows DLL versions, please see win32/DLL_FAQ.txt
-
-- For 64-bit Irix, deflate.c must be compiled without any optimization. With
-  -O, one libpng test fails. The test works in 32 bit mode (with the -n32
-  compiler flag). The compiler bug has been reported to SGI.
-
-- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
-  when compiled with cc.
-
-- On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
-  necessary to get gzprintf working correctly. This is done by configure.
-
-- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
-  other compilers. Use "make test" to check your compiler.
-
-- gzdopen is not supported on RISCOS or BEOS.
-
-- For PalmOs, see http://palmzlib.sourceforge.net/
-
-
-Acknowledgments:
-
-  The deflate format used by zlib was defined by Phil Katz.  The deflate and
-  zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
-  people who reported problems and suggested various improvements in zlib; they
-  are too numerous to cite here.
-
-Copyright notice:
-
- (C) 1995-2022 Jean-loup Gailly and Mark Adler
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  Jean-loup Gailly        Mark Adler
-  jloup@gzip.org          madler@alumni.caltech.edu
-
-If you use the zlib library in a product, we would appreciate *not* receiving
-lengthy legal documents to sign.  The sources are provided for free but without
-warranty of any kind.  The library has been entirely written by Jean-loup
-Gailly and Mark Adler; it does not include third-party code.  We make all
-contributions to and distributions of this project solely in our personal
-capacity, and are not conveying any rights to any intellectual property of
-any third parties.
-
-If you redistribute modified sources, we would appreciate that you include in
-the file ChangeLog history information documenting your changes.  Please read
-the FAQ for more information on the distribution of modified source versions.