FluidSynth 2.0.6 (EmuELEC fluidsynth-git, PKG_SHA256 matched) loads
any argument whose header is RIFF sfbk and names no SoundFont.
SC-55.sf2 is named only by emuelec-utils:67 and no EmuELEC package
or script installs or fetches it, so the entry is unsourceable: user
supplied, no canonical file.
