backport branches/nmad@22313: fix dir local emacs mode for people using a default different from c-basic-offset 8

.dir-locals.el

@@ -1,4 +1,6 @@
 ;; Hey Emacs, use the ugly style!
 
 ((c-mode . ((c-file-style . "linux")
+	    (c-basic-offset . 8)
+	    (tab-width . 8)
 	    (indent-tabs-mode . t))))