[jfx20u] RFR: 8306115: Update libxml2 to 2.10.4

Wed Apr 26 04:12:53 UTC 2023

Clean Backport

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Commit messages:
 - Backport cf5b8389cd70d41a22d645added25a9978640e2c

Changes: https://git.openjdk.org/jfx20u/pull/15/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx20u&pr=15&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306115
  Stats: 95 lines in 12 files changed: 59 ins; 6 del; 30 mod
  Patch: https://git.openjdk.org/jfx20u/pull/15.diff
  Fetch: git fetch https://git.openjdk.org/jfx20u.git pull/15/head:pull/15

PR: https://git.openjdk.org/jfx20u/pull/15