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

When running in CI it fails when path/address is longer 108

Closes GH-8617.

Author: andypost

ext/sockets/tests/socket_cmsg_credentials.phpt

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

ext/sockets/tests/socket_cmsg_rights.phpt

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