[skip ci] Skip failing mbstring test on Windows x86 32-bit

Author: iluuu1994

ext/mbstring/tests/utf_encodings.phpt

@@ -5,6 +5,7 @@ mbstring
 --SKIPIF--
 <?php
 if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
+if (substr(PHP_OS, 0, 3) === 'WIN' && PHP_INT_SIZE === 4) die("skip not for Windows x86");
 ?>
 --FILE--
 <?php