maint: update copyrights for 2013 and as per current GNU standards

src/transform.c

@@ -1,5 +1,5 @@
 /* This file is part of GNU tar.
-   Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
+   Copyright 2006-2008, 2013 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
@@ -12,8 +12,7 @@
    Public License for more details.
 
    You should have received a copy of the GNU General Public License along
-   with this program; if not, write to the Free Software Foundation, Inc.,
-   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <system.h>
 #include <regex.h>