games/openbve: update OpenBVE to version 1.9.2.2

Among the usual round of bug fixes and significant changes, it is
now possible to uncouple vehicles from the player train. Whilst
(probably) not immediately useful, it is another significant step
along the path of moving away from the simple linear world model.

While here, make ALL_TARGET subject to defined(WITH_DEBUG).

Reported by: portscout