dev-libs/expat: Sync with Gentoo

It's from Gentoo commit e4b19b25c4e401cfaec6c19d6e82fce5905ad7ad.

sdk_container/src/third_party/portage-stable/dev-libs/expat/Manifest

@@ -1 +1,2 @@
 DIST expat-2.5.0.tar.xz 460560 BLAKE2B 670298d076ff3b512a0212170d40cb04c601a11d6b152f215a5302ad3238c69c2386393d7a6c70bc284be35ce97bf27d87115c3391f4bc17406e509d739d3e31 SHA512 2da73b991b7c0c54440485c787e5edeb3567230204e31b3cac1c3a6713ec6f9f1554d3afffc0f8336168dfd5df02db4a69bcf21b4d959723d14162d13ab87516
+DIST expat-2.6.0.tar.xz 483448 BLAKE2B 2f0117317bde4e03d8662bcac1ff6c2bbb1af694846b21a82ac12d11ccd43032b481af72fa35298c3cb19b7426dba6a67e703904ca7b05663ffd854a42348bd0 SHA512 d6f1c4a1a2ec8ffc04c04d6767cc8dd7dea3d132d10b8a2c45c5bfb405893c75db032b87a56cc88300b61c961dd7f9782b93aa74dddc7e66f25acb0c6c82b1fd

sdk_container/src/third_party/portage-stable/dev-libs/expat/expat-2.6.0.ebuild

@@ -0,0 +1,95 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+AUTOTOOLS_AUTO_DEPEND=no
+AT_NOEAUTOHEADER=yes  # because expat_config.h.in would need post-processing
+inherit autotools multilib-minimal
+
+DESCRIPTION="Stream-oriented XML parser library"
+HOMEPAGE="https://libexpat.github.io/"
+SRC_URI="https://github.com/libexpat/libexpat/releases/download/R_${PV//\./_}/expat-${PV}.tar.xz"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+IUSE="examples static-libs test unicode"
+RESTRICT="!test? ( test )"
+BDEPEND="unicode? ( ${AUTOTOOLS_DEPEND} )"
+
+DOCS=( README.md )
+
+src_prepare() {
+	default
+
+	# fix interpreter to be a recent/good shell
+	sed -i -e "1s:/bin/sh:${BASH}:" conftools/get-version.sh || die
+	if use unicode; then
+		cp -R "${S}" "${S}"w || die
+		pushd "${S}"w >/dev/null
+		find -name Makefile.am \
+			-exec sed \
+			-e 's,libexpat\.la,libexpatw.la,' \
+			-e 's,libexpat_la,libexpatw_la,' \
+			-i {} + || die
+		eautoreconf
+		popd >/dev/null
+	fi
+}
+
+multilib_src_configure() {
+	local myconf="$(use_with test tests) $(use_enable static-libs static) --without-docbook"
+
+	mkdir -p "${BUILD_DIR}"w || die
+
+	if use unicode; then
+		pushd "${BUILD_DIR}"w >/dev/null
+		CPPFLAGS="${CPPFLAGS} -DXML_UNICODE" ECONF_SOURCE="${S}"w econf ${myconf}
+		popd >/dev/null
+	fi
+
+	ECONF_SOURCE="${S}" econf ${myconf}
+}
+
+multilib_src_compile() {
+	emake
+
+	if use unicode; then
+		pushd "${BUILD_DIR}"w >/dev/null
+		emake -C lib
+		popd >/dev/null
+	fi
+}
+
+multilib_src_install() {
+	emake install DESTDIR="${D}"
+
+	if use unicode; then
+		pushd "${BUILD_DIR}"w >/dev/null
+		emake -C lib install DESTDIR="${D}"
+		popd >/dev/null
+
+		pushd "${ED}"/usr/$(get_libdir)/pkgconfig >/dev/null
+		cp expat.pc expatw.pc
+		sed -i -e '/^Libs/s:-lexpat:&w:' expatw.pc || die
+		popd >/dev/null
+	fi
+}
+
+multilib_src_install_all() {
+	einstalldocs
+
+	doman doc/xmlwf.1
+
+	# Note: Use of HTML_DOCS would add unwanted "doc" subfolder
+	docinto html
+	dodoc doc/*.{css,html}
+
+	if use examples; then
+		docinto examples
+		dodoc examples/*.c
+		docompress -x usr/share/doc/${PF}/examples
+	fi
+
+	find "${D}" -name '*.la' -type f -delete || die
+}