Make tests compatible with libxml2 2.9.12

This version of libxml introduced quite a few changes. Most of
them are differences in error reporting, while some also change
behavior, e.g

Make tests compatible with libxml2 2.9.12

This version of libxml introduced quite a few changes. Most of
them are differences in error reporting, while some also change
behavior, e.g. null bytes are no longer supported and xinclude
recursion is limited.

Closes GH-7030. Closes GH-7046.

Co-authored-by: Nikita Popov <nikic@php.net>

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Fix #80268: loadHTML() truncates at NUL bytes

libxml2 has no particular issues parsing HTML strings with NUL bytes;
these just cause truncation of the current text content, but parsing

Fix #80268: loadHTML() truncates at NUL bytes

libxml2 has no particular issues parsing HTML strings with NUL bytes;
these just cause truncation of the current text content, but parsing
continues generally. Since `::loadHTMLFile()` already supports NUL
bytes, `::loadHTML()` should as well.

Note that this is different from XML, which does not allow any NUL
bytes.

Closes GH-6368.

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