upgraded announce-gen to GPLv3

[Paul Eggert]

In upgrading Autoconf to GPLv3 I found that announce-gen (taken from
gnulib) was still GPLv3.  I installed this change.  This script is
meant only for maintainers so the v2-v3 issue shouldn't be a problem
here.

2007-07-22  Paul Eggert  <address@hidden>

        * build-aux/announce-gen: Update to GPLv3.

--- build-aux/announce-gen      27 Feb 2007 12:38:45 -0000      1.5
+++ build-aux/announce-gen      22 Jul 2007 16:10:45 -0000
@@ -1,7 +1,7 @@
 #!/usr/bin/perl -w
 # Generate a release announcement message.

-my $VERSION = '2007-02-25 16:41'; # UTC
+my $VERSION = '2007-07-22 16:09'; # UTC
 # The definition above must lie within the first 8 lines in order
 # for the Emacs time-stamp write hook (at end) to update it.
 # If you change this file with Emacs, please let the write hook
@@ -9,10 +9,10 @@ my $VERSION = '2007-02-25 16:41'; # UTC

 # Copyright (C) 2002-2007 Free Software Foundation, Inc.

-# This program is free software; you can redistribute it and/or modify
+# 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 Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.

 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -20,8 +20,7 @@ my $VERSION = '2007-02-25 16:41'; # UTC
 # GNU General 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.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

 # Written by Jim Meyering