Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/README-alpha

Index: bison/src/bison/2.4.1/bison-2.4.1-src/README-alpha
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--- bison/src/bison/2.4.1/bison-2.4.1-src/README-alpha	(revision 0)
+++ bison/src/bison/2.4.1/bison-2.4.1-src/README-alpha	(revision 0)
@@ -0,0 +1,30 @@
+-*- text -*-
+
+This is a test release of this package.  Using it more or less
+implicitly signs you up to help us find whatever problems you report.
+
+The documentation still needs more work.  Suggestions welcome.
+Patches even more welcome.
+
+Please send comments and problem reports about this test release to
+<bug-bison@gnu.org>.  This program will get better only if you report
+the problems you encounter.
+
+-----
+
+Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Bison.
+
+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 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
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+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, see <http://www.gnu.org/licenses/>.