audio/portmidi: New port: Library for real time MIDI input and output
PortMIDI is a cross platform (Windows, macOS, Linux, and BSDs which support
alsalib) library for interfacing with operating systems' MIDI I/O APIs. It was
started by Ross Bencina and Phil Burk, then maintained by Roger B. Dannenberg,
and now maintained by the Mixxx DJ Software team.