dev-libs/libffi: Sync with Gentoo

It's from Gentoo commit 14ad94f5562a817d99ee3fdf1fa65bbbf8163f20.

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

@@ -1,3 +1,4 @@
 DIST libffi-3.4.4.tar.gz 1362394 BLAKE2B 189fe1ffe9507f204581b0ab09995dc7e7b761bb4eac7e338e9f5ff81431aebcef6c182c1839c9f9acb2706697a260c67e6d1351cf7e2aed7c4eb5d694f6f8fd SHA512 88680aeb0fa0dc0319e5cd2ba45b4b5a340bc9b4bcf20b1e0613b39cd898f177a3863aa94034d8e23a7f6f44d858a53dcd36d1bb8dee13b751ef814224061889
 DIST libffi-3.4.6.tar.gz 1391684 BLAKE2B af8402a09bdbd59b4e9400d2d71bd5ce98f6f1d981d35d1ab40d77a831b13b32c5bd34ca54ff75999e39f0d8a9c066381fae7a8d6c5216d955e064f929f08b88 SHA512 033d2600e879b83c6bce0eb80f69c5f32aa775bf2e962c9d39fbd21226fa19d1e79173d8eaa0d0157014d54509ea73315ad86842356fc3a303c0831c94c6ab39
 DIST libffi-3.4.7.tar.gz 1393979 BLAKE2B 0dd17b4fd358beb9842889168437443137445a5dba1f0a7e8669ae420d8efb927815c08602c1b1b141acfdfdbaa12b417863402a5c8df5f36519fd3e772d3f37 SHA512 d19f59a5b5d61bd7d9e8a7a74b8bf2e697201a19c247c410c789e93ca8678a4eb9f13c9bee19f129be80ade8514f6b1acb38d66f44d86edd32644ed7bbe31dd6
+DIST libffi-3.4.8.tar.gz 1397992 BLAKE2B 10b3d970dc598fb8689bca49751cda499ddc5216baf89d38625385b0d42d57f10d15cce3c4c044c9c73a4fce384c26f2a8e1b99269e9db1174c2631201c6bfd4 SHA512 05344c6c1a1a5b44704f6cf99277098d1ea3ac1dc11c2a691c501786a214f76184ec0637135588630db609ce79e49df3dbd00282dd61e7f21137afba70e24ffe

sdk_container/src/third_party/portage-stable/dev-libs/libffi/libffi-3.4.8.ebuild

@@ -0,0 +1,83 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit multilib-minimal preserve-libs
+
+MY_PV=${PV/_rc/-rc}
+MY_P=${PN}-${MY_PV}
+
+DESCRIPTION="Portable, high level programming interface to various calling conventions"
+HOMEPAGE="https://sourceware.org/libffi/"
+
+if [[ ${PV} == 9999 ]] ; then
+	EGIT_REPO_URI="https://github.com/libffi/libffi"
+	inherit autotools git-r3
+else
+	SRC_URI="https://github.com/libffi/libffi/releases/download/v${MY_PV}/${MY_P}.tar.gz"
+
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+fi
+
+S="${WORKDIR}"/${MY_P}
+
+LICENSE="MIT"
+# This is a core package which is depended on by e.g. Python.
+# Please use preserve-libs.eclass in pkg_{pre,post}inst to cover users
+# with FEATURES="-preserved-libs" or another package manager if SONAME changes.
+SLOT="0/8" # SONAME=libffi.so.8
+IUSE="debug +exec-static-trampoline pax-kernel static-libs test"
+
+RESTRICT="!test? ( test )"
+BDEPEND="test? ( dev-util/dejagnu )"
+
+src_prepare() {
+	default
+
+	[[ ${PV} == 9999 ]] && eautoreconf
+
+	if [[ ${CHOST} == arm64-*-darwin* ]] ; then
+		# ensure we use aarch64 asm, not x86 on arm64
+		sed -i -e 's/aarch64\*-\*-\*/arm64*-*-*|&/' \
+			configure configure.host || die
+	fi
+}
+
+multilib_src_configure() {
+	# --includedir= path maintains a few properties:
+	# 1. have stable name across libffi versions: some packages like
+	#    dev-lang/ghc or kde-frameworks/networkmanager-qt embed
+	#    ${includedir} at build-time. Don't require those to be
+	#    rebuilt unless SONAME changes. bug #695788
+	#
+	#    We use /usr/.../${PN} (instead of former /usr/.../${P}).
+	#
+	# 2. have ${ABI}-specific location as ffi.h is target-dependent.
+	#
+	#    We use /usr/$(get_libdir)/... to have ABI identifier.
+	ECONF_SOURCE="${S}" econf \
+		--includedir="${EPREFIX}"/usr/$(get_libdir)/${PN}/include \
+		--disable-multi-os-directory \
+		$(use_enable static-libs static) \
+		$(use_enable exec-static-trampoline exec-static-tramp) \
+		$(use_enable pax-kernel pax_emutramp) \
+		$(use_enable debug)
+}
+
+multilib_src_test() {
+	emake -Onone check
+}
+
+multilib_src_install_all() {
+	einstalldocs
+	find "${ED}" -name "*.la" -delete || die
+}
+
+pkg_preinst() {
+	preserve_old_lib /usr/$(get_libdir)/libffi.so.7
+}
+
+pkg_postinst() {
+	preserve_old_lib_notify /usr/$(get_libdir)/libffi.so.7
+}