[Media_api] problem compiling portmidi test programs on Mac OS 10.4

[Roger Dannenberg]

Bill,
	Try the latest version I just added to

www.cs.cmu.edu/~music/portmusic/portmidi

I'm working to integrate all the info and makefiles, tests, etc. for 
Common Lisp. They're not all there yet, but this more recent code should 
build on OS X 10.4.8.

I'd be happy to hear from others. This latest code incorporates a number 
of old bug fixes and adds multi-processor-safe FIFOs.

Also, at some point, some midi message filter code was accidentally 
removed from the API. It is now restored.

-Roger