RFR: 8283328: Update libxml2 to 2.9.13 [v2]

[Johan Vos]

On Fri, 1 Apr 2022 08:19:28 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

>> We currently use libxml2 version 2.9.12. It should be updated to latest stable release, which is version 2.9.13.
>> The steps to update libxml are documented in UPDATING.txt.
>> There is compilation issue with the release 2.9.13, as mentioned here: https://gitlab.gnome.org/GNOME/libxml2/-/issues/349.
>> Updated the code with the changes as per the fix mentioned in above link.
>> 
>> Compiled and verified on Windows, Mac and Linux platforms.
>> Sanity testing looks fine.
>
> Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add README.md and update libxml2.md

This looks good. Just for my understanding: this is the 2.9.13-tagged plus the fix for the issue with xmlValidNormalizeString() with --without-valid-build (https://gitlab.gnome.org/GNOME/libxml2/-/commit/d05317cee5eb2bd35269b7706a8850c6c3097de3) ?
I notice there was a followup patch (https://gitlab.gnome.org/GNOME/libxml2/-/commit/b057239b3f65c8dd9d472fc878214ea4b1d852d3) but that doesn't touch files we have, and since builds are compiling for me, it seems that we are all good now.

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