Fix audio on master branch (build > 5512?)

Fix audio build on current ADHD master (sometimes after build 5511, not sure exactly which build).

Tested in `2014-02-23_14-09-14_drinkcat_chroagh_fix-audio-master-5512_-R_precise_30`. Note that `parrot-dev` failed, because its current build `5433.0.0` does not have a stabilize branch (dev channel is now `5500.4.0`, so it's a transient problem), and master is not compatible with `5433`.