pulseaudio: 10.0 -> 11.1

pulseaudio: 10.0 -> 11.1

11.0 release notes:
https://www.freedesktop.org/wiki/Software/PulseAudio/Notes/11.0/

Additional changes in 11.1:
 * Fix a crash in filter modules related to flat volumes and volume
   sharing
 * Fix a crash when the bluetooth adapter reports weird MTU size
 * Disable bluetooth MTU autodetection by default
 * Add mixer handling back for hardware that doesn't have any alsa-lib
   configuration
 * Prioritize USB devices over built-in sound cards (11.0 was supposed
   to have this feature, but the implementation turned out to be
   incomplete)

Dropped backported patch:
pulseaudio-discuss-iochannel-don-t-use-variable-length-array-in-union.patch

Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
Signed-off-by: Ross Burton <ross.burton@intel.com>