Tests

Fix zig -isystem overriding #2281

Job	Run time
php-cs-fixer	17s
phpstan	24s
PHPUnit (PHP 8.4)	20s
Define Matrix	10s
Build PHP Test (PHP 8.4 macos-15)	13m 26s
Build PHP Test (PHP 8.4 ubuntu-22.04)	15m 10s
Build PHP Test (PHP 8.4 ubuntu-latest)	6m 22s
Build PHP Test (PHP 8.4 macos-13)	16m 58s
Build PHP Test (PHP 8.4 ubuntu-22.04-arm)	15m 19s
	1h 8m 26s

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