libpng: upgrade 1.6.38 -> 1.6.39
Changelog:
==========
* Changed the error handler of oversized chunks (i.e. larger than
PNG_USER_CHUNK_MALLOC_MAX) from png_chunk_error to png_benign_error.
* Fixed a buffer overflow error in contrib/tools/pngfix.
* Fixed a memory leak (CVE-2019-6129) in contrib/tools/pngcp.
* Disabled the ARM Neon optimizations by default in the CMake file,
following the default behavior of the configure script.
* Allowed configure.ac to work with the trunk version of autoconf.
* Removed the support for "install" targets from the legacy makefiles;
removed the obsolete makefile.cegcc.
* Cleaned up the code and updated the internal documentation.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit
19799cb50a00561b318cba1c8c20737f20e4a47f)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>