Hey, This libretro package needs a frontend to work, like RetroArch, Phoenix [1], Gnome Games [2] or ZMZ [3]. I think "Provides: snes9x" is not the case, with snes9x or snes9x-gtk the user expects a standalone program.
that libretro core of snes9x does not provide snes9x due are not functional without a fronend as retroarch!