Update error message for libxml 2.13

External entity loading got its error level decreased in upstream,
which means they now map to E_NOTICE. Also the error message format has
change

Update error message for libxml 2.13

External entity loading got its error level decreased in upstream,
which means they now map to E_NOTICE. Also the error message format has
changed.

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Fix GH-11160: Few tests failed building with new libxml 2.11.0

It's possible to categorise the failures into 2 categories:
- Changed error message. In this case we either duplicate the

Fix GH-11160: Few tests failed building with new libxml 2.11.0

It's possible to categorise the failures into 2 categories:
- Changed error message. In this case we either duplicate the test and
modify the error message. Or if the change in error message is
small, we use the EXPECTF matchers to make the test compatible with both
old and new versions of libxml2.
- Missing warnings. This is caused by a change in libxml2 where the
parser started using SAX APIs internally [1]. In this case the
error_type passed to php_libxml_internal_error_handler() changed from
PHP_LIBXML_ERROR to PHP_LIBXML_CTX_WARNING because it internally
started to use the SAX handlers instead of the generic handlers.
However, for the SAX handlers the current input stack is empty, so
nothing is actually printed. I fixed this by falling back to a
regular warning without a filename & line number reference, which
mimicks the old behaviour. Furthermore, this change now also shows
an additional warning in a test which was previously hidden.

[1] https://gitlab.gnome.org/GNOME/libxml2/-/commit/9a82b94a94bd310db426edd453b0f38c6c8f69f5

Closes GH-11162.

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Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

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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