implementation of his sound/focus patch. NOTE: only alsa 0.9 is tested
(Rhamph, can you test 0.5, please?) and only the alsa drivers stop the
hardware right ow.
WARNING!!! you /will/ have to re-install your plugins, or you will get
segfaults when the window gains/loses focus.
How do you tell if a window has focus on first mapping in X11?