dev-libs/libuv: Sync with Gentoo

It's from Gentoo commit 84a0960fa006493d697c09da3e4532e0cdc2894c.

Signed-off-by: Flatcar Buildbot <buildbot@flatcar-linux.org>

sdk_container/src/third_party/portage-stable/dev-libs/libuv/files/libuv-1.51.0-ppc32-uring.patch

@@ -0,0 +1,21 @@
+https://bugs.gentoo.org/941738
+
+There are reports of this working with libuv-1.51.0 and cmake-4.1.2 but
+the fix was likely on the kernel side which means it's not something we
+can rely on, especially for an arch like ppc32.
+
+This could be submitted upstream if we can identify what actually fixed
+it and therefore the first good kernel version to check for, as we do
+for hppa.
+--- a/src/unix/linux.c
++++ b/src/unix/linux.c
+@@ -464,6 +464,9 @@ static int uv__use_io_uring(uint32_t flags) {
+ #elif defined(__powerpc64__) || defined(__ppc64__)
+   /* See https://github.com/libuv/libuv/issues/4283. */
+   return 0; /* Random SIGSEGV in signal handler. */
++#elif defined(__powerpc__) && !defined(__powerpc64__)
++  /* See https://bugs.gentoo.org/941738. */
++  return 0; /* Crash in uv__spawn_and_init_child_fork. */
+ #else
+   /* Ternary: unknown=0, yes=1, no=-1 */
+   static _Atomic int use_io_uring;

sdk_container/src/third_party/portage-stable/dev-libs/libuv/libuv-1.51.0-r1.ebuild

@@ -0,0 +1,63 @@
+# 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/libuv.asc
+inherit autotools verify-sig
+
+DESCRIPTION="Cross-platform asychronous I/O"
+HOMEPAGE="https://github.com/libuv/libuv"
+
+if [[ ${PV} = 9999* ]]; then
+	EGIT_REPO_URI="https://github.com/libuv/libuv.git"
+	inherit git-r3
+else
+	SRC_URI="
+		https://dist.libuv.org/dist/v${PV}/libuv-v${PV}.tar.gz -> ${P}.tar.gz
+		verify-sig? ( https://dist.libuv.org/dist/v${PV}/libuv-v${PV}.tar.gz.sign -> ${P}.tar.gz.sig )
+	"
+	KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+	S="${WORKDIR}/${PN}-v${PV}"
+fi
+
+LICENSE="BSD BSD-2 ISC MIT"
+SLOT="0/1"
+
+BDEPEND="
+	dev-build/libtool
+	virtual/pkgconfig
+	verify-sig? ( sec-keys/openpgp-keys-libuv )
+"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.48.0-test-thread-priority-portage.patch
+	"${FILESDIR}"/${PN}-1.51.0-ppc32-uring.patch
+)
+
+src_prepare() {
+	default
+
+	if [[ ${CHOST} == *-darwin* && ${CHOST##*darwin} -le 9 ]] ; then
+		eapply "${FILESDIR}"/${PN}-1.41.0-darwin.patch
+	fi
+
+	# Upstream fails to ship a configure script and has missing m4 file.
+	echo "m4_define([UV_EXTRA_AUTOMAKE_FLAGS], [serial-tests])" \
+		> m4/libuv-extra-automake-flags.m4 || die
+	eautoreconf
+}
+
+src_configure() {
+	local myeconfargs=(
+		cc_cv_cflags__g=no
+	)
+
+	econf "${myeconfargs[@]}"
+}
+
+src_install() {
+	default
+
+	find "${ED}" -name '*.la' -delete || die
+}