Adding bumped version of libpngg for firefox 65

media-libs/libpng/Manifest

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+DIST libpng-1.6.35-apng.patch.gz 10396 SHA512 40cda24d003089c31786b70fd581cdd960f338ae89535646a2188bc8e25e603a6ad2080406017bd45edb298442a88dd60ada1ec650b001596d216e8194a3dda1
+DIST libpng-1.6.35.tar.xz 1014320 SHA512 b69152bc7869e98536effa8e45e2dac7bffee26aa9e31fc90b37506a702256919bcf4dd9cadc42fa4e45143bc023ffd7c637742367e58707e8c2226b3a09eee0

media-libs/libpng/libpng-1.6.35.ebuild

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+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit libtool ltprune multilib-minimal
+
+DESCRIPTION="Portable Network Graphics library"
+HOMEPAGE="http://www.libpng.org/"
+SRC_URI="mirror://sourceforge/${PN}/${P}.tar.xz
+	apng? ( mirror://sourceforge/apng/${P}-apng.patch.gz )"
+
+LICENSE="libpng"
+SLOT="0/16"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~ppc-aix ~x64-cygwin ~amd64-fbsd ~sparc-fbsd ~x86-fbsd ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~m68k-mint ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris ~x86-winnt"
+IUSE="apng cpu_flags_x86_sse neon static-libs"
+
+RDEPEND=">=sys-libs/zlib-1.2.8-r1:=[${MULTILIB_USEDEP}]
+	abi_x86_32? ( !<=app-emulation/emul-linux-x86-baselibs-20130224-r1
+		!app-emulation/emul-linux-x86-baselibs[-abi_x86_32(-)] )"
+DEPEND="${RDEPEND}
+	app-arch/xz-utils"
+
+src_prepare() {
+	default
+	if use apng; then
+		eapply -p0 "${WORKDIR}"/${PN}-*-apng.patch
+		# Don't execute symbols check with apng patch wrt #378111
+		sed -i -e '/^check/s:scripts/symbols.chk::' Makefile.in || die
+	fi
+	elibtoolize
+}
+
+multilib_src_configure() {
+	local myeconfargs=(
+		$(use_enable cpu_flags_x86_sse intel-sse)
+		$(use_enable static-libs static)
+		--enable-arm-neon=$(usex neon)
+	)
+	ECONF_SOURCE="${S}" econf "${myeconfargs[@]}"
+}
+
+multilib_src_install_all() {
+	DOCS=( ANNOUNCE CHANGES libpng-manual.txt README TODO )
+	einstalldocs
+	prune_libtool_files --all
+}