package/fluidsynth: new package

package/fluidsynth: new package

FluidSynth is a real-time software synthesizer based on the SoundFont
2 specifications and has reached widespread distribution. FluidSynth
itself does not have a graphical user interface, but due to its
powerful API several applications utilize it and it has even found its
way onto embedded systems and is used in some mobile apps.

http://www.fluidsynth.org/

Signed-off-by: Julien Olivain <juju@cotds.org>
Reviewed-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>