Updating libxml2 to v2.15.3. Verified with build and sanity testing on all platforms.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - update libxml2.md - libxml all platforms Changes: https://git.openjdk.org/jfx/pull/2173/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2173&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8384522 Stats: 111 lines in 10 files changed: 69 ins; 18 del; 24 mod Patch: https://git.openjdk.org/jfx/pull/2173.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/2173/head:pull/2173 PR: https://git.openjdk.org/jfx/pull/2173
