Release notes: https://raw.githubusercontent.com/pnggroup/libpng/v1.6.45/ANNOUNCE https://raw.githubusercontent.com/pnggroup/libpng/v1.6.46/ANNOUNCE Use sha1 hash from sourceforge.net and locally compute sha256 hash due to missing release announcement: https://sourceforge.net/p/png-mng/mailman/png-mng-announce/ Updated license hash due to copyright year bump: https://github.com/pnggroup/libpng/commit/6f786ff0f6bf4b971a7159d2b4a95e8a0770892f Signed-off-by: Bernd Kuhls <bernd@kuhls.net> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>