Remove obsolete file

Ignore-this: 2b437a0e2a7cd6891c88e43a286283d

darcs-hash:20130711100749-58252-b64c5fd59fc4507e9111b3e2676aab9ea3ff791c
Remove references to Portaudio

Ignore-this: b7cf7e82521d24de9dafa64e6a8776d3

darcs-hash:20130711101003-58252-af5f3d4841e501f181dff0c33bc329b4f380f468