xbmc: update to xbmc-83b16d0

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.8.8

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv