8269131: Update libxml2 to version 2.9.12

[arapte]

We currently use libxml2 version 2.9.10. It should be updated to latest stable release, which is version 2.9.12.
The steps to update libxml are documented in UPDATING.txt.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8269131: Update libxml2 to version 2.9.12

Reviewers

• Kevin Rushforth (@kevinrushforth - Reviewer)
• Johan Vos (@johanvos - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jfx pull/562/head:pull/562
$ git checkout pull/562

Update a local copy of the PR:
$ git checkout pull/562
$ git pull https://git.openjdk.java.net/jfx pull/562/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 562

View PR using the GUI difftool:
$ git pr show -t 562

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jfx/pull/562.diff

[bridgekeeper]

👋 Welcome back arapte! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[mlbridge]

Webrevs

• 01: Full - Incremental (2298581c)
• 00: Full (4e1d6a43)

[kevinrushforth]

/reviewers 2

[openjdk]

@kevinrushforth
The number of required reviews for this PR is now set to 2 (with at least 1 of role reviewers).

[kevinrushforth]

The changes look good except for the expansion of tags in Makefile.am (we don't want to expand tabs in Makefiles). I recommend re-copying Makefile.am from the original sources of libxml 2.9.12. I left a couple questions on the new instructions in UPDATING.txt as well.

I did a build / test on all 3 platforms. No issues observed.

[johanvos]

confirmed to work on linux, win, mac (x86_64)

[openjdk]

@arapte This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8269131: Update libxml2 to version 2.9.12

Reviewed-by: kcr, jvos

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 4 new commits pushed to the master branch:

• 47c2ec3: 8187229: Tree/TableCell: cancel event must return correct editing location
• 0e7cf62: 8185447: The special high-contrast mode of JavaFX Controls in Japanese environment do not work.
• 6403d67: 8231558: [macos] Platform.exit causes assertion error on macOS 10.15 or later
• 61aff1c: 8258499: JavaFX: Move src.zip out of the lib directory

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[arapte]

/integrate

[openjdk]

Going to push as commit 52c076c.
Since your change was applied there have been 4 commits pushed to the master branch:

• 47c2ec3: 8187229: Tree/TableCell: cancel event must return correct editing location
• 0e7cf62: 8185447: The special high-contrast mode of JavaFX Controls in Japanese environment do not work.
• 6403d67: 8231558: [macos] Platform.exit causes assertion error on macOS 10.15 or later
• 61aff1c: 8258499: JavaFX: Move src.zip out of the lib directory

Your commit was automatically rebased without conflicts.

[openjdk]

@arapte Pushed as commit 52c076c.

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