portmidi update

[rbdannenberg]

Hi acmanderson,

I'm the creator of PortMidi. I was a bit surprised to find how many portmidi versions there are on Github. I've finally gotten around to making a number of updates that are mostly minor but long overdue.

I also decided it would be wise to host a copy of PortMidi on Github.

I went through every copy of PortMidi I could find, looking at 4583 files and running diff 7961 times, but who's counting? :-)

I picked up a few fixes from the collective work, although with this many files and changes, I'm sure I missed something.

Yours appears to be just an application using PortMidi. You might want to grab newer sources or library, and if you find any problems, I'd be happy to know.

Thanks,
Roger