Windows native lib build directory

I have just tried to build this lib for Windows, but I had some problems. As specified in the Ant task, the directory to which the native lib is compiled is "win32", not "windows":

    <condition property="platform" value="win32">
      <os family="windows"/>
    </condition>

Moreover, I use the MinGW GNU compiler for Windows. I tried both 32 and 64-bit versions, and both compile to files with ".so" extension. I don't know if it is because cpptasks appends ".so" in windows systems or if it is MinGW's "fault". Either way, I also had to replace the second parameter in Native.java. I'm not pushing that modification because I don't know if other compilers (e.g. Visual C++) behave this way too.