Add a small howto explaining how to cross-compile for MinGW

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@28881 b3059339-0415-0410-9bf9-f77b7e298cf2

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+Due to a lack of Windows developers, it is a good idea to allow Linux
+developers to do at least some basic check of their code.
+This HOWTO explains how to set up MinGW cross-compilation under Debian.
+
+First, you need to install the "mingw32" package and get a MPlayer SVN checkou.
+
+Next, you need quite a lot of dependencies. Since this is for testing and
+not actually use, the easiest way is to use this package:
+http://natsuki.mplayerhq.hu/~reimar/mpl_mingw32.tar.bz2
+NOTE that this is likely to be quite out-dated and might include packages
+with security issues, so do not use it to build binaries for real use.
+
+After extracting this package into the MPlayer source-tree, 
+you only need to run the included linux-mingw.sh to configure (it just runs
+./configure --host-cc=cc --target=i686-mingw32msvc --cc=i586-mingw32msvc-cc
+--windres=i586-mingw32msvc-windres --ranlib=i586-mingw32msvc-ranlib
+--with-extraincdir="$PWD/osdep/mingw32"
+--with-extralibdir="$PWD/osdep/mingw32"
+--with-freetype-config="$PWD/osdep/mingw32/ftconf") and then run make.
+
+You should be able to run the generated binary with Wine, if you want to.
+
+The steps as command-lines:
+
+sudo apt-get install mingw32
+svn co svn://svn.mplayerhq.hu/mplayer/trunk MPlayer-mingw
+cd MPlayer-mingw
+wget http://natsuki.mplayerhq.hu/~reimar/mpl_mingw32.tar.bz2
+tar -xjf mpl_mingw32.tar.bz2
+sh linux-mingw.sh
+make