Log Message:
fluidsynth: update to 2.1.7.

    a regression introduced in 2.1.0 prevented chorus from being audible when \ 
fluid_synth_process() was used (#751, thanks to @chirs241097)
    a regression introduced in 2.0.6 prevented the MIDI player from restarting \ 
playback after all files have been played (#755, thanks to @rncbc)
    fix a double-free violation introduced in 2.0.0 after executing the info \ 
shell command (#756)