RFR: 8283328: Update libxml2 to 2.9.13

Fri Apr 1 08:26:50 UTC 2022

On Thu, 31 Mar 2022 20:11:51 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> 1. As noted in [SKARA-1222](https://bugs.openjdk.java.net/browse/SKARA-1222), your patch introduces a sym-link that is causing jcheck to throw an exception. Given that we do not want any sym-links in the repo anyway, you will need to revert the file in question.

--- Fixed symlinks issue by reverting the file

> 2. Once the above is fixed, you will note that jcheck reports some whitespace errors.

-- Resolved

> 3. You need to update the version in [libxml2.md](https://github.com/openjdk/jfx/blob/f169dde501c58fe107ab6da7f35667efb4992b65/modules/javafx.web/src/main/legal/libxml2.md).

-- Updated

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PR: https://git.openjdk.java.net/jfx/pull/764