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- Update to version 1.6.40:
  * Fixed the eXIf chunk multiplicity checks.
  * Fixed a memory leak in pCAL processing.
  * Corrected the validity report about tRNS inside png_get_valid().
  * Fixed various build issues on *BSD, Mac and Windows.
  * Updated the configurations and the scripts for continuous integration.
  * Cleaned up the code, the build scripts, and the documentation.

- do not use NEON instructions [bsc#1211176]

- Fix license tag to libpng-2.0.

- Fix build: some*.la files are symlinks. Adjust spec to use
   find -type f,l

- switch to pkgconfig(zlib) to allow alternative providers as well
- build with glibc hwcaps optimized libs

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- install rpm macros in %{_rpmmacrodir} [bsc#1185661]
- call spec-cleaner

- enable hardware optimizations (such as SSE)

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- make check actually works under asan

- version update to 1.6.37
  Fixed a use-after-free vulnerability (CVE-2019-7317) in png_image_free.
  Fixed a memory leak in the ARM NEON implementation of png_do_expand_palette.
  Fixed a memory leak in pngtest.c.
  Fixed two vulnerabilities (CVE-2018-14048, CVE-2018-14550) in
    contrib/pngminus; refactor.
  Changed the license of contrib/pngminus to MIT; refresh makefile and docs.
    (Contributed by Willem van Schaik)
  Added makefiles for AddressSanitizer-enabled builds.
- deleted patches
  - libpng-arm-free.patch (upstreamed)

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- fix arm build [bsc#1121829]
  + libpng-arm-free.patch

- asan_build: build ASAN included
- debug_build: build more suitable for debugging, install pngcp

- update to 1.6.36:
   Replaced the remaining uses of png_size_t with size_t (Cosmin)
    Fixed the calculation of row_factor in png_check_chunk_length
      (reported by Thuan Pham in SourceForge issue #278)
    Added missing parentheses to a macro definition
      (suggested by "irwir" in GitHub issue #216)
    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")

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- security update:
  * CVE-2018-13785 [bsc#1100687]
    + libpng16-CVE-2018-13785.patch

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- check with -j1

- Fix SRPM group and grammar issues.

- removed obsoleted Obsoletes

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