removes one last compat

PortAudio v0.5.0 [a24cf8e]

PortAudio v0.4.0 [eaa5aa9]

PortAudio v0.3.0 [b6f59a1]

PortAudio v0.2.1 [2889669]

PortAudio v0.2.0 [2bda1cf]

AudioIO v0.1.1 [99ac59c]

AudioIO v0.1.0 [f75de32]

AudioIO v0.0.4 [18f0cee]

AudioIO v0.0.2 [c2fdb53]