Insert Emacs magic to the first line.

lib/Makefile.tmpl

@@ -1,4 +1,4 @@
-# Makefile for GNU tar library.
+# Makefile for GNU tar library.	-*- Makefile -*-
 
 # Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2003, 2004, 2005
 # Free Software Foundation, Inc.