At least for the near future, the KUKSA.val support for vehicle
signals in libqtappfw will use the VISS standard websocket
interface scheme, so add qtwebsockets as a build dependency.
Bug-AGL: SPEC-4408
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I5c5b5e187651d0f30d267e1f21c0196c270859f0