Now mingw-portaudio actually builds with DirectSound.
Added all the specs/source-patches needed to build Mixxx's dependencies.
Presently, those are (in order of building/installing) libmad, portmidi, protobuf, libid3tag, taglib, flac, gsm, libsndfile, libsamplerate, portaudio, jack-audio-connection-kit, kde-filesystem, and phonon.
Coming soon: phonon, qt (rebuilt to use phonon), vamp-plugin-sdk, and hss1394.