Skip pcntl_sigwaitinfo() test under asan/msan

This test often fails under asan/msan with a timeout for unknown
reasons.

Author: nikic

ext/pcntl/tests/002.phpt

@@ -6,6 +6,7 @@ pcntl: pcntl_sigprocmask(), pcntl_sigwaitinfo(), pcntl_sigtimedwait()
 	elseif (!extension_loaded('posix')) die('skip posix extension not available');
 	elseif (!function_exists('pcntl_sigwaitinfo') or !function_exists('pcntl_sigtimedwait')) die('skip required functionality is not available');
 	elseif (!defined('CLD_EXITED')) die('skip CLD_EXITED not defined');
+	elseif (getenv('SKIP_ASAN')) die('skip Fails intermittently under asan/msan');
 ?>
 --FILE--
 <?php