Made hunspell work on Windows

Now it's possible to link it against the hunspell on windows, though the client would utterly crash if the paths passed to hunspell are invalid.
Making spell check work will require making an installer for windows that would put dictionaries into the right path and making some other things, so when you are done with the spell check I most likely would ask you to change the destination branch of your PR to some other branch I will create to sort thing out, because we have automatic builds set up on the master branch and it wouldn't be nice to break those.