Skip posix_setrlimit() test on FreeBSD

FreeBSD does not report an error on the second call, the limit is
simply not raised.

Author: nikic

ext/posix/tests/posix_setrlimit.phpt

@@ -4,6 +4,8 @@ posix_setrlimit(): Basic tests
 <?php
 if (!extension_loaded('posix')) die('skip - POSIX extension not loaded');
 if (!function_exists('posix_setrlimit')) die('skip posix_setrlimit() not found');
+// On FreeBSD the second call does not report an error, though the limit isn't changed either.
+if (str_contains(PHP_OS, 'FreeBSD')) die('skip different behavior on FreeBSD');
 ?>
 --FILE--
 <?php