Stdlib: xml_parser_set_option(null) E_WARNING string|int|bool (#30652)

[PurHur]

Summary

• xml_parser_set_option($parser, $option, null) now emits Zend 8.3+/8.4 E_WARNING (Argument #3 ($value) must be of type string|int|bool, null given) and still returns true / applies the option (ext/xml/xml.c PHP_FUNCTION(xml_parser_set_option)).
• Non-string|int|bool values (float, array, …) take the same warning path. string|int|bool paths stay silent.
• Withheld on the 8.4.0-dev reference / unset PHP_COMPILER_PROFILE so Zend 8.2 stays silent.

php-src: ext/xml/xml.c (zpp "Olz" then php_error_docref(E_WARNING, …) then zend_is_true / RETURN_TRUE). PHP implementation: ext/xml/xml_parser_set_option.php. No new C.

Closes #30652

Test plan

• PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/issue_30652_xml_parser_set_option_null.php → Warning + true
• PHP_COMPILER_PROFILE=8.2 php bin/vm.php test/repro/issue_30652_xml_parser_set_option_null.php → true (silent)
• php -d memory_limit=512M vendor/bin/phpunit --filter XmlParserSetOptionNull30652Test → OK 5/5
• php -d memory_limit=512M vendor/bin/phpunit --filter 'XmlModuleSkeletonTest|XmlParserSetOptionNull30652Test|XmlErrorStringNull30651Test' → OK 18/18
• php script/bootstrap-inventory.php --check → OK 7386/7386
• AOT/JIT not in issue done-when (XmlFunction::call still VM-only)
• make bootstrap-selfhost-link still running at PR time — stale gen-0 Zend fallback (Trust: refresh gen-0 spine sidecar — stamp ≠ spine SHA; link falls back to Zend (prelinked/bootstrap-gen0) #28998); this change does not touch spine/gen-0

Repro transcript (PROFILE=8.4)

PHP Warning:  xml_parser_set_option(): Argument #3 ($value) must be of type string|int|bool, null given in test/repro/issue_30652_xml_parser_set_option_null.php on line 5
true

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