RFR: 8306115 : Update libxml2 to 2.10.4

[Hima Bindu Meda]

Updated libxml to v2.10.4.Configured and verified on all Windows, Linux and Mac.
Sanity testing looks fine.

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Commit messages:
 - version update for linux
 - update xmlversion on windows
 - Update version info
 - White space corrections
 - Update libxml to v2.10.4

Changes: https://git.openjdk.org/jfx/pull/1108/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1108&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/jfx/pull/1108.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1108/head:pull/1108

PR: https://git.openjdk.org/jfx/pull/1108