Remove lchown($file, -5); test

Some operating systems choose to return EINVAL for users (and groups) out of range (e.g. user ids must not be negative) instead of EPERM.
This thus cannot be deterministically tested for all systems - and we are anyway already testing the branch with errno with the inexistent filename (ENOENT) - thus no problem removing it.

Author: bwoebi

ext/standard/tests/file/lchown_error.phpt

@@ -43,9 +43,6 @@ var_dump( lchown( 'foobar_lchown.txt', $uid ) );
 var_dump( lchown( new StdClass(), $uid ) );
 var_dump( lchown( array(), $uid ) );
 
-// Bad user
-var_dump( lchown( $filename, -5 ) );
-
 ?>
 ===DONE===
 --CLEAN--
@@ -72,7 +69,4 @@ bool(true)
 
 Warning: lchown() expects parameter 1 to be a valid path, array given in %s on line %d
 bool(true)
-
-Warning: lchown(): %r(Operation not permitted|Invalid argument)%r in %s on line %d
-bool(false)
 ===DONE===