fluidsynth: add sf3 to soundfont search path
In Debian, soundfonts in SF3 format (i.e. the same as SF2 format but with Ogg/Vorbis-compressed samples) are installed into /usr/share/sounds/sf3. Soundfonts in SF3 format are supported since FluidSynth 1.1.7 (released in Feb 2018), so update dependencies accordingly.
Edited by Fabian Greffrath