[wrynose][PATCH 10/20] libxml2: inherit upstream-stable-release-point

[<daniel.turull@ericsson.com>]

From: Daniel Turull <daniel.turull@ericsson.com>

libxml2 maintains per-minor stable branches (2.9 through 2.15) that take
only bug-fix micro releases, and releases from several of them in
parallel: 2.13.9 and 2.14.6 went out the same day, after 2.14.5 was
already out. So upgrades within a major.minor are stable point upgrades
per the OE-Core stable release policy (ref-manual, "Stable Point Release
Upgrades").

  https://docs.yoctoproject.org/dev/ref-manual/release-process.html#stable-point-release-upgrades
  https://gitlab.gnome.org/GNOME/libxml2/-/tree/2.15

Checked the last three point releases. 2.15.3 (Apr 15 2026) is five
security fixes plus an "Improvements" section that is also entirely fixes,
and 2.15.1 (Oct 16 2025) is security, regression and build fixes. 2.15.2
(Mar 03 2026) is five CVE fixes plus one addition, a --xpath0 option
confined to the xmllint command-line tool.

A public-header diff across the three shows zero added, removed or changed
libxml2.so declarations, so the library API and ABI are unaffected by that
addition.

Already tracked this way on the OE stable branches, counting only bumps
since each branch forked: kirkstone picked up 2.9.14, scarthgap 2.12.5 ->
2.12.10.

AI-Generated: Kiro with Claude Opus 5
Signed-off-by: Daniel Turull <daniel.turull@ericsson.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>

Adapted for wrynose: applied to libxml2_2.15.2.bb (upstream: libxml2_2.15.3.bb).
(cherry picked from commit a9fd7975e991124b8f54c4c763917e705fb4213c)
---
 meta/recipes-core/libxml/libxml2_2.15.2.bb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/meta/recipes-core/libxml/libxml2_2.15.2.bb b/meta/recipes-core/libxml/libxml2_2.15.2.bb
index 9181949ea5..660e2dede2 100644
--- a/meta/recipes-core/libxml/libxml2_2.15.2.bb
+++ b/meta/recipes-core/libxml/libxml2_2.15.2.bb
@@ -30,6 +30,10 @@ BINCONFIG = "${bindir}/xml2-config"
 
 inherit autotools pkgconfig binconfig-disabled ptest
 
+# libxml2 publishes bugfix/security-only micro releases on its per-minor
+# release branches.
+inherit upstream-stable-release-point
+
 LDFLAGS:append:riscv64 = "${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-lld ptest', ' -fuse-ld=bfd', '', d)}"
 
 RDEPENDS:${PN}-ptest += "locale-base-en-us"