- libsoxr now used instead of libsamplerate
- audio/portaudio-svn still used instead of the bundled copy (only the
portmixer subsystem makes use of additional interfaces available in
the bundled and patched portaudio)
- portmidi support can't be easily deactivated and lacks support for OpenBSD
Committing this early so other people can work on it in-tree. Prodded by
ajacoutot@.
77591311e1