Added configure script wrapper for mingw-w64 cross-compiler.

This script is used to build official Windows build.

mingw-config

@@ -0,0 +1,76 @@
+#!/bin/sh -e
+
+# aria2 - The high speed download utility
+#
+# Copyright (C) 2012 Tatsuhiro Tsujikawa
+#
+# 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 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+#
+# In addition, as a special exception, the copyright holders give
+# permission to link the code of portions of this program with the
+# OpenSSL library under certain conditions as described in each
+# individual source file, and distribute linked combinations
+# including the two.
+# You must obey the GNU General Public License in all respects
+# for all of the code used other than OpenSSL.  If you modify
+# file(s) with this exception, you may extend this exception to your
+# version of the file(s), but you are not obligated to do so.  If you
+# do not wish to do so, delete this exception statement from your
+# version.  If you delete this exception statement from all source
+# files in the program, then also delete it here.
+
+# This is the configure script wrapper for cross-compiling MinGW32
+# build on Debian Linux using mingw-w64. Some environment variables
+# can be adjusted to change build settings:
+#
+# HOST: cross-compile to build programs to run on HOST. It defaults to
+#       i686-w64-mingw32. To build 64 bit binary, specify
+#       x86_64-w64-mingw32.
+#
+# PREFIX: Prefix to the directory where dependent libraries are
+#       installed.  It defaults to /usr/local/$HOST. -I$PREFIX/include
+#       will be added to CPPFLAGS. -L$PREFIX/lib will be added to
+#       LDFLAGS. $PREFIX/lib/pkgconfig will be set to
+#       PKG_CONFIG_LIBDIR.
+#
+# In this configuration, the following dependent libraries are used:
+#
+# * c-ares
+# * openssl
+# * expat
+# * sqlite3
+# * zlib
+# * cppunit
+
+test -z "$HOST" && HOST=i686-w64-mingw32
+test -z "$PREFIX" && PREFIX=/usr/local/$HOST
+
+./configure \
+    --host=$HOST \
+    --prefix=$PREFIX \
+    --without-included-gettext \
+    --disable-nls \
+    --with-libcares \
+    --without-gnutls \
+    --with-openssl \
+    --with-sqlite3 \
+    --without-libxml2 \
+    --with-libexpat \
+    --with-libz \
+    --with-cppunit-prefix=$PREFIX \
+    ARIA2_STATIC=yes \
+    CPPFLAGS="-I$PREFIX/include" \
+    LDFLAGS="-L$PREFIX/lib" \
+    PKG_CONFIG_LIBDIR="$PREFIX/lib/pkgconfig"