RFR: 8361893 : Update libxml2 to 2.14.5

[Hima Bindu Meda]

Updated libxml2 to v2.14.5.
Verified build on all platforms. No issues seen

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Commit messages:
 - whitespace correction
 - whitespace correction
 - white space correction
 - configure libxml on windows
 - update license file for libxml
 - configure libxml on linux
 - add missing files
 - update libxml to v2.14.5

Changes: https://git.openjdk.org/jfx/pull/1886/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1886&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361893
  Stats: 48058 lines in 103 files changed: 12675 ins; 14541 del; 20842 mod
  Patch: https://git.openjdk.org/jfx/pull/1886.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1886/head:pull/1886

PR: https://git.openjdk.org/jfx/pull/1886