audio/pulseaudio: update to 11.0
- Drop --disable-xen following upstream change in 10.0
Changes: https://www.freedesktop.org/wiki/Software/PulseAudio/Notes/11.0/
ABI: https://abi-laboratory.pro/tracker/timeline/pulseaudio/
PR: 222093
Submitted by: lightside <lightside@gmx.com>
MFH: 2017Q3