libpng: upgrade 1.6.43 -> 1.6.44

Changelog:
===========
- Hardened calculations in chroma handling to prevent overflows, and
  relaxed a constraint in cHRM validation to accomodate the standard
  ACES AP1 set of color primaries.
- Removed the ASM implementation of ARM Neon optimizations and updated
  the build accordingly. Only the remaining C implementation shall be
  used from now on, thus ensuring the support of the PAC/BTI security
  features on ARM64.
- Fixed the pickup of the PNG_HARDWARE_OPTIMIZATIONS option in the
  CMake build on FreeBSD/amd64. This is an important performance fix
  on this platform.
- Applied various fixes and improvements to the CMake build.
- Added fuzzing targets for the simplified read API.
- Fixed a build error involving pngtest.c under a custom config.
- Fixed and improved the config files for AppVeyor CI and Travis CI.

(From OE-Core rev: c41984d59a0408b2991c195494e0246f49a05cc8)

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

meta/recipes-multimedia/libpng/libpng_1.6.44.bb

@@ -11,7 +11,7 @@ DEPENDS = "zlib"
 LIBV = "16"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/${BPN}/${BPN}${LIBV}/${BP}.tar.xz"
-SRC_URI[sha256sum] = "6a5ca0652392a2d7c9db2ae5b40210843c0bbc081cbd410825ab00cc59f14a6c"
+SRC_URI[sha256sum] = "60c4da1d5b7f0aa8d158da48e8f8afa9773c1c8baa5d21974df61f1886b8ce8e"
 
 MIRRORS += "${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}${LIBV}/ ${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}${LIBV}/older-releases/"