[Discuss-gnuradio] gr-audio-osx updated for Intel Macs

[Michael Dickens]

I've checked in the changes needed for gr-audio-osx to support both  
PPC and Intel Macs using the same codebase.

Another change, moving towards interface-similarity with other audio  
modules, is that the Source now auto-detects the desired number of  
output streams, and internally does not do computations on any unused  
streams.

I will work towards moving the Sink to auto-detect, but it's a bit  
more complicated.  I will also add support for user-selected audio  
input / output device via the second argument ... keying on any part  
of the device name string.

Thank you to those who've provided feedback! - MLD