Make sure to make any old files readable (e.g., from an aborted prior

"make dist")

This commit was SVN r26281.

contrib/dist/make_dist_tarball

@@ -10,7 +10,7 @@
 #                         University of Stuttgart.  All rights reserved.
 # Copyright (c) 2004-2005 The Regents of the University of California.
 #                         All rights reserved.
-# Copyright (c) 2008-2011 Cisco Systems, Inc.  All rights reserved.
+# Copyright (c) 2008-2012 Cisco Systems, Inc.  All rights reserved.
 # $COPYRIGHT$
 # 
 # Additional copyrights may follow
@@ -253,6 +253,7 @@ make_tarball() {
     # happened to be in the tree already).
     #
     echo "*** Removing old generated flex files..."
+    chmod -R a+rw .
     find . -name \*_lex.c -exec rm -f {} \; -print
 
     #