OpenSceneGraph-3.0.1 version bump and automagic

- Bumped version to latest stable which supports curl-7.25.0.
- Dropped off some automagic and added appropriate flags and
  dependencies (especially on ffmpeg[<1.0]).
- Brought in patch for xine-lib[>=1.2.0]
OpenSceneGraph-3.1.5 development version added
simgear-2.10.0 version bump
flightgear-2.10.0 version bump