[jfx25u] RFR: 8361893: Update libxml2 to 2.14.5

[Hima Bindu Meda]

clean backport

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Commit messages:
 - Backport 15c50c20b80a9287d5b136a197454eabac604a34

Changes: https://git.openjdk.org/jfx25u/pull/12/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx25u&pr=12&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361893
  Stats: 50107 lines in 105 files changed: 12675 ins; 16590 del; 20842 mod
  Patch: https://git.openjdk.org/jfx25u/pull/12.diff
  Fetch: git fetch https://git.openjdk.org/jfx25u.git pull/12/head:pull/12

PR: https://git.openjdk.org/jfx25u/pull/12