Update Zint

3rdparty/zint-2.10.0/win32/zint_cmdline_vc6/readme.txt

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+Harald Oehlmann
+2021-06-10
+
+Why to use VC6 ?
+It avoids DLL Hell as the runtime is present on all Windows Versions since XP.
+I compile on Windows 10 64 bit.
+
+How to compile:
+
+$ZR is the zint root folder (this file is in $ZR\win32\zint_cmdline_vc6)
+
+* get vc6 shell
+(if not available in the Start Menu, open a Command Prompt and run
+"C:\Program Files (x86)\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT")
+
+a) zlib (current version: 1.2.11)
+* put zlib to $ZR\..\zlib
+cd $ZR\..\zlib
+nmake -f win32\Makefile.msc
+-> generates zlib.lib, zlib1.dll
+
+b) lpng (current version: 1.6.37)
+* put libpng to $ZR\..\lpng
+cd $ZR\..\lpng
+nmake -f scripts\makefile.vcwin32
+-> generates $ZR\..\lpng\libpng.lib
+
+c) open zint_cmdline_vc6.dsw in this folder with the msvc6 gui and compile