[backend] Update libcommuni to 3.7. Resolves #193
[backend] Update libcommuni to 3.7. Resolves #193

Signed-off-by: Björn Bidar <98956b378934db91ace7f37757fdd09a74df421e@thaodan.de>

communi/communi-sailfish,communi/communi-sailfish,communi/communi-sailfish