Stdlib: register array_uasort()/array_uksort() (Closes #5649)

[PurHur]

Summary

• Register array_uasort() and array_uksort() as Zend aliases delegating to existing uasort() / uksort() builtins (ext/standard/array.c php_array_uasort / php_array_uksort).
• PHP-in-PHP only: thin delegate wrappers in ext/standard/array_uasort.php and array_uksort.php; no C runtime changes.

php-src reference

• ext/standard/array.c — PHP_FUNCTION(array_uasort), PHP_FUNCTION(array_uksort)

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro-maintainer/parity_array_uasort_uksort.php
vendor/bin/phpunit --filter array_uasort_uksort
vendor/bin/phpunit --filter array_uksort_jit
php bin/compile.php -l test/repro-maintainer/parity_array_uasort_uksort.php
'

VM repro output:

true
true
array (
  'a' => 1,
  'b' => 2,
)
array (
  'a' => 2,
  'b' => 1,
)

PHPUnit: array_uasort_uksort OK (VM + JIT), array_uksort_jit OK (VM + JIT)

AOT: php bin/compile.php -l test/repro-maintainer/parity_array_uasort_uksort.php exit 0

Closes #5649

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