Updating libxml2 to v2.15.4

There are a few additional changes.
- win legacy build system was removed in libxml v2.15.0, It is now removed from 
JavaFX source as well.
    - modules/javafx.web/src/main/native/Source/ThirdParty/libxml/src/win32
- Two unused files are removed:
   1. 
modules/javafx.web/src/main/native/Source/ThirdParty/libxml/mac/include/xmlversion.h
   2. 
modules/javafx.web/src/main/native/Source/ThirdParty/libxml/src/include/wsockcompat.h
- UPDATING.txt is updated. With the updated configure commands, it requires 
less changes in generated xmlversion.h file.

Verified the build and all test run on all platforms.

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- [x] I confirm that I make this contribution in accordance with the [OpenJDK 
Interim AI Policy](https://openjdk.org/legal/ai).

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Commit messages:
 - libxml update 2154

Changes: https://git.openjdk.org/jfx/pull/2323/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2323&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8392009
  Stats: 3031 lines in 30 files changed: 326 ins; 2620 del; 85 mod
  Patch: https://git.openjdk.org/jfx/pull/2323.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2323/head:pull/2323

PR: https://git.openjdk.org/jfx/pull/2323

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