issue #871 in hedgewars: "Hedgehog dropping into water while still attached to a rope makes engine crash" Due to doStepRopeWork's being completely skipped 75% of the ticks - including drowning/detachment-condition checks

[patterns]
**.h = native
**.c = native
**.cpp = native
**.lua = native
**.txt = native
**.pas = native
**.inc = native
**.hs = native