Bison bootstrap fix to use latest version of gnulib

[Paul Eggert]

I noticed that autoreconf overwrote some gnulib files with older versions
of the same files, so I installed this:

2006-01-19  Paul Eggert  <address@hidden>

        * bootstrap: Undo changes to gnulib files that autoreconf made.

--- bootstrap   12 Dec 2005 20:59:30 -0000      1.33
+++ bootstrap   20 Jan 2006 00:45:53 -0000      1.34
@@ -2,7 +2,7 @@
 
 # Bootstrap this package from CVS.
 
-# Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+# Copyright (C) 2003, 2004, 2005, 2006 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
@@ -281,6 +281,15 @@ intl_files_to_remove='
 echo $0: rm -fr $intl_files_to_remove ...
 rm -fr $intl_files_to_remove || exit
 
+# Undo changes to gnulib files that autoreconf made.
+for gnulib_file in $gnulib_files; do
+  test ! -f $gnulib_file || cmp -s $gnulib_file $GNULIB_SRCDIR/$gnulib_file || 
{
+    rm -f $gnulib_file &&
+    echo "$0: Copying file $GNULIB_SRCDIR/$gnulib_file again" &&
+    cp -p $GNULIB_SRCDIR/$gnulib_file $gnulib_file || exit
+  }
+done
+
 # Put bug-reporting address into po/Makevars.
 echo "$0: sed '/^MSGID_BUGS_ADDRESS *=/s/=.*/= address@hidden/' 
po/Makevars.template >po/Makevars ..."
 sed '/^MSGID_BUGS_ADDRESS *=/s/=.*/= address@hidden/' po/Makevars.template 
>po/Makevars