xbmc: update to xbmc-13-692cfba

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/RPi/patches/xbmc: update RPi patch, this should fix #3181, this should fix #2981

Signed-off-by: Stephan Raue <stephan@openelec.tv>
llvm: update to llvm-3.4.1

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Mesa: add upstream patches to enable geometry shaders with LLVM-3.4.1 on radeonsi

Signed-off-by: Stephan Raue <stephan@openelec.tv>