Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/m4/wchar_t.m4

Index: bison/src/bison/2.4.1/bison-2.4.1-src/m4/wchar_t.m4
===================================================================
--- bison/src/bison/2.4.1/bison-2.4.1-src/m4/wchar_t.m4	(revision 0)
+++ bison/src/bison/2.4.1/bison-2.4.1-src/m4/wchar_t.m4	(revision 0)
@@ -0,0 +1,20 @@
+# wchar_t.m4 serial 1 (gettext-0.12)
+dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Bruno Haible.
+dnl Test whether <stddef.h> has the 'wchar_t' type.
+dnl Prerequisite: AC_PROG_CC
+
+AC_DEFUN([gt_TYPE_WCHAR_T],
+[
+  AC_CACHE_CHECK([for wchar_t], gt_cv_c_wchar_t,
+    [AC_TRY_COMPILE([#include <stddef.h>
+       wchar_t foo = (wchar_t)'\0';], ,
+       gt_cv_c_wchar_t=yes, gt_cv_c_wchar_t=no)])
+  if test $gt_cv_c_wchar_t = yes; then
+    AC_DEFINE(HAVE_WCHAR_T, 1, [Define if you have the 'wchar_t' type.])
+  fi
+])