ext/standard/tests: use die() instead of echo for 64-bit skip condition

Author: arshidkv12

ext/standard/tests/GHSA-96wq-48vp-hh57.phpt

@@ -8,7 +8,7 @@ memory_limit=3G
 <?php
 if (!getenv('RUN_RESOURCE_HEAVY_TESTS')) die('skip resource-heavy test');
 if (getenv('SKIP_SLOW_TESTS')) die('skip slow test');
-if (PHP_INT_SIZE != 8) echo 'skip 64-bit only';
+if (PHP_INT_SIZE != 8)  die('skip 64-bit only');
 ?>
 --FILE--
 <?php