[jfx11u] Integrated: 8269131: Update libxml2 to version 2.9.12

[Kevin Rushforth]

On Tue, 17 Aug 2021 17:27:49 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Clean backport of third-party update to libxml2 2.9.12.
> 
> As an FYI, I tested this patch in my [test-kcr-11.0.13](https://github.com/kevinrushforth/jfx11u/tree/test-kcr-11.0.13) branch, which has the aggregate set of patches for the following bugs: [JDK-8211308](https://bugs.openjdk.java.net/browse/JDK-8211308), [JDK-8268915](https://bugs.openjdk.java.net/browse/JDK-8268915), [JDK-8269147](https://bugs.openjdk.java.net/browse/JDK-8269147), [JDK-8269131](https://bugs.openjdk.java.net/browse/JDK-8269131), [JDK-8268849](https://bugs.openjdk.java.net/browse/JDK-8268849), [JDK-8270479](https://bugs.openjdk.java.net/browse/JDK-8270479), [JDK-8272329](https://bugs.openjdk.java.net/browse/JDK-8272329).

This pull request has now been integrated.

Changeset: f930bc53
Author:    Kevin Rushforth <kcr at openjdk.org>
URL:       https://git.openjdk.java.net/jfx11u/commit/f930bc53384abf051be073ded8ac470859129abd
Stats:     4134 lines in 62 files changed: 1582 ins; 1362 del; 1190 mod

8269131: Update libxml2 to version 2.9.12

Backport-of: 52c076c50f3cab17628db4dd2b1b37cb2d6ce92a

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PR: https://git.openjdk.java.net/jfx11u/pull/33