RFR: 8352162: Update libxml2 to 2.13.8 [v6]

[Jay Bhaskar]

On Mon, 21 Apr 2025 18:57:38 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Jay Bhaskar has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   remove unused files
>
> modules/javafx.web/src/main/native/Source/ThirdParty/libxml/linux/config.h line 67:
> 
>> 65: 
>> 66: /* Define to 1 if you have the <poll.h> header file. */
>> 67: /* #undef HAVE_POLL_H */
> 
> Is this no longer needed?

this is autogenerated , not my change, it looks valid

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PR Review Comment: https://git.openjdk.org/jfx/pull/1785#discussion_r2053881215