Stdlib: socket_addrinfo_lookup(null) soft-null Deprecated+false (#30337)

[PurHur]

Summary

• Soft socket_addrinfo_lookup(null) matches Zend: E_DEPRECATED + false (php-src Z_PARAM_STR).
• declare(strict_types=1) still TypeErrors citing $host.
• PHP-in-PHP only via VmString::stringBuiltinArgForFrame (same pattern as Regression: socket_connect(..., null) soft TypeError — Zend Deprecated+Warning+false (ext/sockets/sockets.c) #30316).

Closes #30337

php-src reference

• ext/sockets/sockets.c — PHP_FUNCTION(socket_addrinfo_lookup) host Z_PARAM_STR
• Implementation: ext/sockets/socket_addrinfo_lookup.php

Test plan

• Issue repro Zend vs VM
• vendor/bin/phpunit --filter SocketAddrinfoLookupSoftNullVMTest (2 tests OK)

Verification

=== VM soft ===
PHP Deprecated:  socket_addrinfo_lookup(): Passing null to parameter #1 ($host) of type string is deprecated …
false
=== VM strict ===
TypeError: socket_addrinfo_lookup(): Argument #1 ($host) must be of type string, null given
OK (2 tests, 2 assertions)

Not covered: full ci-fast / JIT (builtin is VM-only for addrinfo_lookup).

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