libpng: upgrade 1.6.40 -> 1.6.41

Changelog:
===========
- Added SIMD-optimized code for the Loongarch LSX hardware.
- Fixed the run-time discovery of MIPS MSA hardware.
- Fixed an off-by-one error in the function 'png_do_check_palette_indexes',
  which failed to recognize errors that might have existed in the first
  column of a broken palette-encoded image. This was a benign regression
  accidentally introduced in libpng-1.6.33. No pixel was harmed.
- Fixed, improved and modernized the contrib/pngminus programs, i.e.,
  png2pnm.c and pnm2png.c
- Removed old and peculiar portability hacks that were meant to silence
  warnings issued by gcc version 7.1 alone.
- Fixed and modernized the CMake file, and raised the minimum required
  CMake version from 3.1 to 3.6.
- Allowed the configure script to disable the building of auxiliary tools
  and tests, thus catching up with the CMake file.
- Fixed a build issue on Mac.
- Moved the Autoconf macro files to scripts/autoconf.
- Moved the CMake files (except for the main CMakeLists.txt) to
  scripts/cmake and moved the list of their contributing authors to
  scripts/cmake/AUTHORS.md
- Updated the CI configurations and scripts.
- Relicensed the CI scripts to the MIT License.
- Improved the test coverage.

License-Update: Copyright year updated to 2024.

(From OE-Core rev: 4e0ec5769416938a22f64dc4767480acf76fd247)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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