[skip ci] use die() instead of echo for 64-bit skip condition

Author: LamentXU123

ext/date/tests/gh-124.phpt

@@ -4,7 +4,7 @@ Test for timelib #124: Problem with large negative timestamps
 date.timezone=UTC
 --SKIPIF--
 <?php
-if (PHP_INT_SIZE != 8) echo "skip this test is for 64-bit only";
+if (PHP_INT_SIZE != 8) die("skip this test is for 64-bit only");
 if (getenv('SKIP_ASAN')) die('skip triggers undefined behavior');
 ?>
 --FILE--

ext/ffi/tests/gh10403.phpt

@@ -3,7 +3,7 @@ GH-10403: Fix incorrect bitshifting and masking in ffi bitfield
 --EXTENSIONS--
 ffi
 --SKIPIF--
-<?php if (PHP_INT_SIZE != 8) echo "skip this test is for 64-bit only"; ?>
+<?php if (PHP_INT_SIZE != 8) die("skip this test is for 64-bit only"); ?>
 --FILE--
 <?php
 $ffi = FFI::cdef(<<<EOF

ext/gmp/tests/gmp_php_int_max.phpt

@@ -4,7 +4,7 @@ PHP_INT_MAX tests
 gmp
 --SKIPIF--
 <?php
-if (PHP_INT_SIZE != 8) print "skip";
+if (PHP_INT_SIZE != 8) die("skip");
 ?>
 --FILE--
 <?php

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