Added nt/msysconfig.sh.

diff --git a/nt/msysconfig.sh b/nt/msysconfig.sh
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+++ b/nt/msysconfig.sh
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+#! /bin/sh
+### msysconfig.sh - Run the top-level 'configure' script as approriate
+### for the MinGW/MSYS build of a native MS-Windows port of Emacs.
+
+## Copyright (C) 2013 Free Software Foundation, Inc.
+
+## Author: Eli Zaretskii <eliz@gnu.org>
+
+## This file is part of GNU Emacs.
+
+## GNU Emacs 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.
+
+## GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+### Commentary:
+
+## The Posix 'configure' script needs a few tweaks to produce desired
+## results when running under MSYS with the purpose of configuring
+## Emacs for the MinGW MS-Windows build.  Rather than asking users to
+## type these tweaks every time they configure the package, we provide
+## this helper scripts which takes care of the mundane things.
+
+### Code:
+
+srcdir=`dirname "$0"`
+parent=`dirname "$srcdir"`
+
+## The nt/mingw-cfg.site file provides various autoconf variables that
+## are needed for a successful MinGW build.
+CONFIG_SITE="$srcdir/mingw-cfg.site" $parent/configure "$@"