ScummVM engines are not built for synchronous screen locking (i.e.
updateScreen() can't be really used for any sort of blocking updates
otherwise performance suffers).
Single buffering now means deliberate tearing as a speed optimization
and triple buffering provides a tearingless picture with slight overhead.
"make dist-generic" doesn't automatically look for files in "data"
folder. Commit be98f2a8 is somewhat related to this problem but only
for debugging purposes.
As relative "data" clashes with game's relative "data" (e.g. Full
Throttle demo), do the right thing and add it as absolute path.
Miro Kropacek