[jfx20u] Integrated: 8301009: Update libxml2 to 2.10.3

[Hima Bindu Meda]

Clean Backport.This pull request contains a backport of commit [935c7b79](https://github.com/openjdk/jfx/commit/935c7b797d79407d741735324313684617d1292d) from the [openjdk/jfx](https://git.openjdk.org/jfx) repository.

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Commit messages:
 - Backport 935c7b797d79407d741735324313684617d1292d

Changes: https://git.openjdk.org/jfx20u/pull/13/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx20u&pr=13&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301009
  Stats: 6301 lines in 80 files changed: 1128 ins; 4562 del; 611 mod
  Patch: https://git.openjdk.org/jfx20u/pull/13.diff
  Fetch: git fetch https://git.openjdk.org/jfx20u.git pull/13/head:pull/13

PR: https://git.openjdk.org/jfx20u/pull/13