(vc-rcs-state-heuristic): Use file-attributes with ID-FORMAT

`string'.  This allows us to get rid of `vc-user-login-name UID'.

lisp/vc-rcs.el

@@ -152,8 +152,8 @@ For a description of possible values, see `vc-check-master-templates'."
                 (vc-file-setprop file 'vc-checkout-model 'locking))))
           state)
       (if (not (vc-mistrust-permissions file))
-          (let* ((attributes  (file-attributes file))
-                 (owner-uid   (nth 2 attributes))
+          (let* ((attributes  (file-attributes file 'string))
+                 (owner-name  (nth 2 attributes))
                  (permissions (nth 8 attributes)))
             (cond ((string-match ".r-..-..-." permissions)
                    (vc-file-setprop file 'vc-checkout-model 'locking)
@@ -162,7 +162,7 @@ For a description of possible values, see `vc-check-master-templates'."
 		   (if (eq (vc-checkout-model file) 'locking)
 		       (if (file-ownership-preserved-p file)
 			   'edited
-			 (vc-user-login-name owner-uid))
+			 owner-name)
 		     (if (vc-rcs-workfile-is-newer file)
 			 'edited
 		       'up-to-date)))