drop pulse support

I have re-added pulseaudio 8 months ago for testers, it had issues that are still there (and now it has more, wont compile at all, nobody noticed, that means nobody using it). 

there has not been a single contribution since then, seems nobody cares, I'd like to see PA gone.

this is my first "debloat oe" PR, more will follow once you agree to merge this.