Log Message:
Update xnp2 to 0.85.

pkgsrc changes:
- explicitly disable SDL2
  (SDL2_mixer with smpeg2 cannot coexist with SDL_mixer with smpeg)

upstream changes (no English changelog):
- fix crash on reset after changing sound settings on some environments
- add SDL 2.0 support
- fix sound issue when PulseAudio is used as SDL audio backend
- add SPFM Light and C86BOX support