Use posix_getuid() to check for root in pcntl_setpriority() test

Using SUDO_USER doesn't seem to work on Travis ARM CI -- I guess
that sudo might be in use without the target being root.

Author: nikic

ext/pcntl/tests/pcntl_setpriority_basic.phpt

@@ -5,14 +5,14 @@ Er Galvão Abbott [email protected]
 # TestFest 2017 PHPRS PHP UG 2017-10-31
 --SKIPIF--
 <?php
-if (!isset($_SERVER['SUDO_USER'])) {
-    die('skip - this functions needs to run with superuser');
-}
-
 if (!extension_loaded('pcntl')) {
-    die('skip - ext/pcntl not loaded');
-} else if (!function_exists('pcntl_setpriority')) {
-    die('skip - pcntl_setpriority doesn\'t exist');
+    die('skip ext/pcntl not loaded');
+}
+if (!function_exists('pcntl_setpriority')) {
+    die('skip pcntl_setpriority doesn\'t exist');
+}
+if (!function_exists('posix_getuid') || posix_getuid() !== 0) {
+    die('skip this functions needs to run with superuser');
 }
 ?>
 --FILE--