mesa: update the emacs indent files

dirvars package has been replaced by built-in functionality of
dir-locals. preserve the settings in the new infrastructure

.dir-locals.el

@@ -0,0 +1,10 @@
+((nil
+  (indent-tabs-mode . nil)
+  (tab-width . 8)
+  (c-basic-offset . 3)
+  (c-file-style . "stroustrup")
+  (eval . (progn
+	    (c-set-offset 'innamespace '0)
+	    (c-set-offset 'inline-open '0)))
+  )
+ )