fix setcookie Max-Age to use php_time

Author: krakjoe

ext/standard/head.c

@@ -154,7 +154,7 @@ PHPAPI int php_setcookie(zend_string *name, zend_string *value, time_t expires,
 strlcat(cookie, ZSTR_VAL(dt), len + 100);
 zend_string_free(dt);
 
-diff = difftime(expires, time(NULL));
+diff = difftime(expires, php_time());
 if (diff < 0) {
 diff = 0;
 }