RFR: JDK-8286256 : Update libxml2 to 2.9.14

Tue May 17 12:53:32 UTC 2022

On Tue, 17 May 2022 12:32:17 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

> Updated libxml to version 2.9.14.As mentioned in UPDATING.txt, configured for windows , linux and Mac platforms and updated the files accordingly.
> 
> Updated libxslt to version 1.1.35. Generated the config.h files for windows , Mac and linux platforms and updated accordingly.
> 
> Verified the build on all the platforms and sanity testing looks fine.No regressions observed.

Creating UPDATING.txt for libxslt. Will commit it once done.

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PR: https://git.openjdk.java.net/jfx/pull/797