[jfx17u] RFR: 8306115: Update libxml2 to 2.10.4

[Johan Vos]

Clean backport of 
8306115: Update libxml2 to 2.10.4
Reviewed-by: kcr, sykora

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Commit messages:
 - 8306115: Update libxml2 to 2.10.4

Changes: https://git.openjdk.org/jfx17u/pull/133/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=133&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/jfx17u/pull/133.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/133/head:pull/133

PR: https://git.openjdk.org/jfx17u/pull/133