Revert "Make socket path shorter for ext/sockets/tests/socket_cmsg_{rights|credentials}.phpt"

This reverts commit b0c1773, since
this causes CI failures, apparently related to ZTS builds.

Author: cmb69

ext/sockets/tests/socket_cmsg_credentials.phpt

@@ -16,9 +16,8 @@ die('skip SO_PASSCRED is not defined');
 }
 --FILE--
 <?php
-chdir(__DIR__);
-include "./mcast_helpers.php.inc";
-$path = "./socket_cmsg_credentials.sock";
+include __DIR__."/mcast_helpers.php.inc";
+$path = __DIR__ . "/socket_cmsg_credentials.sock";
 
 @unlink($path);
 
@@ -56,8 +55,7 @@ var_dump($data['control'][0]['data']['pid'] === $pid);
 ?>
 --CLEAN--
 <?php
-chdir(__DIR__);
-$path = "./socket_cmsg_credentials.sock";
+$path = __DIR__ . "/socket_cmsg_credentials.sock";
 @unlink($path);
 --EXPECTF--
 creating send socket

ext/sockets/tests/socket_cmsg_rights.phpt

@@ -13,14 +13,12 @@ die('skip not for AIX');
 }
 --CLEAN--
 <?php
-chdir(__DIR__);
-$path = "./socket_cmsg_rights.sock";
+$path = __DIR__ . "/socket_cmsg_rights.sock";
 @unlink($path);
 --FILE--
 <?php
-chdir(__DIR__);
-include "./mcast_helpers.php.inc";
-$path = "./socket_cmsg_rights.sock";
+include __DIR__."/mcast_helpers.php.inc";
+$path = __DIR__ . "/socket_cmsg_rights.sock";
 
 @unlink($path);