sys-devel/m4: Sync with Gentoo

It's from Gentoo commit d91b3fa35b2c9e2d2c0af3139e4041831c0f803c.

sdk_container/src/third_party/portage-stable/sys-devel/m4/Manifest

@@ -1,3 +1,5 @@
 DIST m4-1.4.19-test-198-sysval-r1.patch.gz 6292 BLAKE2B 62f52c8bb75e7b8f11e487906f1ce47069ea6d3095fd6532aa6b47bcd8109b7cd733fde26915d449a1cfc326f27f5ed83ba29a5a80687b8b9bdb73c8d87e96b8 SHA512 c3e7d4c1631e401c6b5477c22fd5de837188acf9d72551b116c665a927d1799b1fb249e90c9fb4f6f2f328ee84b2e4dd0bf54f684139997c19ee5b69a3e9284d
+DIST m4-1.4.19.60-6ebfc.tar.xz 2031984 BLAKE2B d6001b14a4f4bb5bb163463331b9e24469b6b48f690c88796b4d2ca57dc3c31046eb7ece0c2593941aa1b5a0e90e2aa0d85b000e135742286bf90cc7f5d09b57 SHA512 bcb801404ff8f4146e59e8baadae02f5dfac1ce3f860118122430e4facae098628e915d8ee9386abb3c133a0cc2b7c98170a57687c9d85aaa6f130b061b7810f
+DIST m4-1.4.19.60-6ebfc.tar.xz.sig 488 BLAKE2B 71f9c4aec3e981816eda83032474b4d9acccc628c79a5dd9a5e2a077e4f3f30fa6f59fb29ed7e0c1ae7148a4605584b65653eacaee7d06ba006fa2dcb7e425c1 SHA512 5e89d23c7879eb4970f05a6e8fb37eb1b17ece4204bb86cc16bcbb4f4705263725ac70b286c2454249a8a33728784a2434e498deccbbd367424ceef91a36b164
 DIST m4-1.4.19.tar.xz 1654908 BLAKE2B 08694485a49c542761fa9a7db4d7609f4dfb08a5c6b785b57f2e14cf1f696c2a1c788bb5eb934e8159a632b63ff071dfe42511d0109d7b1828f46d33c8bf416a SHA512 47f595845c89709727bda0b3fc78e3188ef78ec818965b395532e7041cabe9e49677ee4aca3d042930095a7f8df81de3da1026b23b6897be471f6cf13ddd512b
 DIST m4-1.4.19.tar.xz.sig 488 BLAKE2B 99e89b1ed0bf158d29a652392fb122e23227e895c75a8c63057ebe33f11b433ab205ae99a991578a89df8c3e723fc00669d8cdb290fbc86eaa6c704b112e4370 SHA512 d6ac9c6a54c57e9b53fb3e34a60d49df2f46a6e494da0a0c9ae8246b984e68a853b5d8c42677c1a0485c3f36b0bce10a481d3775c0edc1dbdfb27b43545bc31e

sdk_container/src/third_party/portage-stable/sys-devel/m4/m4-1.4.19_p20250413.ebuild

@@ -0,0 +1,92 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/m4.asc
+inherit verify-sig
+
+DESCRIPTION="GNU macro processor"
+HOMEPAGE="https://www.gnu.org/software/m4/m4.html"
+if [[ ${PV} == *_p* ]] ; then
+	# Note: could put this in devspace, but if it's gone, we don't want
+	# it in tree anyway. It's just for testing.
+	MY_SNAPSHOT="$(ver_cut 1-3).60-6ebfc"
+	SRC_URI="
+		https://alpha.gnu.org/gnu/${PN}/${PN}-${MY_SNAPSHOT}.tar.xz
+		https://people.redhat.com/eblake/${PN}/${PN}-${MY_SNAPSHOT}.tar.xz
+		verify-sig? (
+			https://alpha.gnu.org/gnu/${PN}/${PN}-${MY_SNAPSHOT}.tar.xz.sig
+			https://people.redhat.com/eblake/${PN}/${PN}-${MY_SNAPSHOT}.tar.xz.sig
+		)
+	"
+	S="${WORKDIR}"/${PN}-${MY_SNAPSHOT}
+else
+	SRC_URI="mirror://gnu/${PN}/${P}.tar.xz"
+	SRC_URI+=" verify-sig? ( mirror://gnu/${PN}/${P}.tar.xz.sig )"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+fi
+
+LICENSE="GPL-3+"
+SLOT="0"
+IUSE="examples nls"
+
+RDEPEND="
+	virtual/libiconv
+	nls? (
+		sys-devel/gettext
+		virtual/libintl
+	)
+"
+DEPEND="${RDEPEND}"
+# Remember: cannot dep on autoconf since it needs us
+BDEPEND="
+	app-arch/xz-utils
+	nls? ( sys-devel/gettext )
+	verify-sig? ( sec-keys/openpgp-keys-m4 )
+"
+
+src_prepare() {
+	default
+
+	# touch generated files after patching m4, to avoid activating maintainer
+	# mode
+	# remove when loong-fix-build.patch is no longer necessary
+	#touch ./aclocal.m4 ./lib/config.hin ./configure ./doc/stamp-vti || die
+	#find . -name Makefile.in -exec touch {} + || die
+}
+
+src_configure() {
+	local -a myeconfargs=(
+		--enable-changeword
+
+		--with-packager="Gentoo Linux"
+		--with-packager-version="${PVR}"
+		--with-packager-bug-reports="https://bugs.gentoo.org/"
+
+		$(usex nls '' '--disable-nls')
+
+		# Disable automagic dependency over libsigsegv; see bug #278026
+		ac_cv_libsigsegv=no
+	)
+
+	econf "${myeconfargs[@]}"
+}
+
+src_test() {
+	[[ -d /none ]] && die "m4 tests will fail with /none/" # bug #244396
+	emake check
+}
+
+src_install() {
+	default
+
+	# autoconf-2.60 for instance, first checks gm4, then m4.  If we don't have
+	# gm4, it might find gm4 from outside the prefix on for instance Darwin
+	use prefix && dosym m4 /usr/bin/gm4
+
+	if use examples ; then
+		dodoc -r examples
+		rm -f "${ED}"/usr/share/doc/${PF}/examples/Makefile*
+	fi
+}