dev-libs/mpfr: Sync with Gentoo

It's from Gentoo commit 474da63926134b9de1b85e3ff7fa13464c8aabea.

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

@@ -1,2 +1,4 @@
 DIST mpfr-4.2.1.tar.xz 1493608 BLAKE2B ad69f53bc910294647523e7613b18a683f1d0f3dd994168ab2a46b66d0371ffa9b8e7cb59495f898470aea69d343e83fc722f11babe4af7b3a12665a1e65860c SHA512 bc68c0d755d5446403644833ecbb07e37360beca45f474297b5d5c40926df1efc3e2067eecffdf253f946288bcca39ca89b0613f545d46a9e767d1d4cf358475
 DIST mpfr-4.2.1.tar.xz.asc 228 BLAKE2B a50ccf4136c3b460b15540364a49dec05da266a77bce6220832262581fa57cc1e70b7739ea4fdf2e8ad4fd3318151b8c420b09597942493d95e6276f380debfd SHA512 2f409f2a93726fba086882de3ad26d0bcb5d78afc687e44550bf55a98b940ff0d355a655aa18da78bfa2581ef37d72cb630d7642de7ec70590ec80044b3dbe38
+DIST mpfr-4.2.2.tar.xz 1505596 BLAKE2B 6bbf5658e70fbb673a3b65246a6bac708d1571aa6943c6742efd92f468ac71e6f0fe351b757f7133440ea312d9a5fc3549acd89d54f4d975c58bdc204d7b21ec SHA512 eb9e7f51b5385fb349cc4fba3a45ffdf0dd53be6dfc74932dc01258158a10514667960c530c47dd9dfc5aa18be2bd94859d80499844c5713710581e6ac6259a9
+DIST mpfr-4.2.2.tar.xz.asc 228 BLAKE2B 9e43ca847d140f78d658b108a699eeb34817c65f60e513a5540450444ae87fc4a087e71c4590b246db6fad253f1c3593c54935200ef22125ac7d514e590dc158 SHA512 ca6ff27d4ac3ac66735cd0b61e1e958217a2d7a4b30abccfda5e49c228bf594a722878992a1816a8f2531c3420aab6f8cdd3d60fd36a66765e9070e901ceac9d

sdk_container/src/third_party/portage-stable/dev-libs/mpfr/mpfr-4.2.2.ebuild

@@ -0,0 +1,98 @@
+# 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/vincentlefevre.asc
+inherit multilib-minimal verify-sig
+
+# Upstream distribute patches before a new release is made
+# See https://www.mpfr.org/mpfr-current/#bugs for the latest version (and patches)
+
+# Check whether any patches touch e.g. manuals!
+# https://archives.gentoo.org/gentoo-releng-autobuilds/message/c2dd39fc4ebc849db6bb0f551739e2ed
+MY_PV=${PV%%_p*}
+MY_PATCH=$(ver_cut 5-)
+MY_PATCHES=()
+MY_P=${PN}-${MY_PV/_/-}
+
+DESCRIPTION="Library for multiple-precision floating-point computations with exact rounding"
+HOMEPAGE="https://www.mpfr.org/ https://gitlab.inria.fr/mpfr"
+SRC_URI="https://www.mpfr.org/${PN}-$(ver_cut 1-3)/${MY_P}.tar.xz"
+SRC_URI+=" verify-sig? ( https://www.mpfr.org/${PN}-$(ver_cut 1-3)/${MY_P}.tar.xz.asc )"
+
+if [[ ${PV} == *_p* ]] ; then
+	# If this is a patch release, we have to download each of the patches:
+	# -_pN = N patches
+	# - patch file names are like: patch01, patch02, ..., patch10, patch12, ..
+	#
+	# => name the ebuild _pN where N is the number of patches on the 'bugs' page.
+	patch_url_base="https://www.mpfr.org/${MY_P}"
+	my_patch_index=
+
+	for ((my_patch_index=1; my_patch_index <= MY_PATCH ; my_patch_index++)) ; do
+		printf -v mangled_patch_ver "patch%02d" "${my_patch_index}"
+
+		SRC_URI+=" ${patch_url_base}/${mangled_patch_ver} -> ${MY_P}-${mangled_patch_ver}.patch"
+
+		MY_PATCHES+=( "${DISTDIR}"/${MY_P}-${mangled_patch_ver}.patch )
+	done
+
+	unset patch_url_base my_patch_index mangled_patch_ver
+fi
+
+S="${WORKDIR}/${MY_P}"
+
+LICENSE="LGPL-3+"
+# This is a critical package; if SONAME changes, bump subslot but also add
+# preserve-libs.eclass usage to pkg_*inst! See e.g. the readline ebuild.
+SLOT="0/6" # libmpfr.so version
+if [[ ${PV} != *_rc* ]] ; then
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+fi
+IUSE="static-libs"
+
+RDEPEND=">=dev-libs/gmp-5.0.0:=[${MULTILIB_USEDEP},static-libs?]"
+DEPEND="${RDEPEND}"
+BDEPEND="verify-sig? ( sec-keys/openpgp-keys-vincentlefevre )"
+
+PATCHES=(
+	# Apply the upstream patches released out-of-band; generated above
+	"${MY_PATCHES[@]}"
+
+	# Additional patches
+)
+
+HTML_DOCS=( doc/FAQ.html )
+
+src_unpack() {
+	use verify-sig && verify-sig_verify_detached "${DISTDIR}"/${MY_P}.tar.xz{,.asc}
+
+	# Avoid src_unpack noise from patches
+	unpack ${MY_P}.tar.xz
+}
+
+src_prepare() {
+	default
+
+	# 4.1.0_p13's patch10 patches a .texi file *and* the corresponding
+	# info file. We need to make sure the info file is newer, so the
+	# build doesn't try to run makeinfo. Won't be needed on next release.
+	#touch "${S}/doc/mpfr.info" || die
+}
+
+multilib_src_configure() {
+	# bug #476336#19
+	# Make sure mpfr doesn't go probing toolchains it shouldn't
+	ECONF_SOURCE="${S}" \
+		user_redefine_cc=yes \
+		econf $(use_enable static-libs static)
+}
+
+multilib_src_install_all() {
+	rm "${ED}"/usr/share/doc/${PF}/COPYING* || die
+
+	if ! use static-libs ; then
+		find "${ED}"/usr -name '*.la' -delete || die
+	fi
+}