Update libpng from 1.6.35 to 1.6.37 #899
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* Changes in 1.6.37 (https://sourceforge.net/projects/libpng/files/libpng16/1.6.37/) * Fixed a memory leak in the ARM NEON implementation of png_do_expand_palette. * Fixed a memory leak in pngtest.c. * Changed the license of contrib/pngminus to MIT; refresh makefile and docs. (Contributed by Willem van Schaik) * Fixed a typo in the libpng license v2. (Contributed by Miguel Ojeda) * Added makefiles for AddressSanitizer-enabled builds. * Cleaned up various makefiles. * Changes in 1.6.36 (https://sourceforge.net/projects/libpng/files/libpng16/1.6.36/) * Optimized png_do_expand_palette for ARM processors. Improved performance by around 10-22% on a recent ARM * Chromebook. (Contributed by Richard Townsend, ARM Holdings) * Fixed manipulation of machine-specific optimization options. (Contributed by Vicki Pfau) * Used memcpy instead of manual pointer arithmetic on Intel SSE2. (Contributed by Samuel Williams) * Fixed build errors with MSVC on ARM64. (Contributed by Zhijie Liang) * Fixed detection of libm in CMakeLists. (Contributed by Cameron Cawley) * Fixed incorrect creation of pkg-config file in CMakeLists. (Contributed by Kyle Bentley) * Fixed the CMake build on Windows MSYS by avoiding symlinks. * Fixed a build warning on OpenBSD. (Contributed by Theo Buehler) * Fixed various typos in comments. (Contributed by "luz.paz") * Raised the minimum required CMake version from 3.0.2 to 3.1. * Removed yet more of the vestigial support for pre-ANSI C compilers. * Removed ancient makefiles for ancient systems that have been broken across all previous libpng-1.6.x versions. * Removed the Y2K compliance statement and the export control information. * Applied various code style and documentation fixes.
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Summary
Validation
To help validate the integrity of the update I have created the following bash script that diffs between my PR branch and the official package provided from the libpng sourceforge.