add reserved space to struct _fluid_synth_channel_info_t
add reserved space to struct _fluid_synth_channel_info_t

FluidSynth/fluidsynth,nezticle/fluidsynth,FluidSynth/fluidsynth,nezticle/fluidsynth,FluidSynth/fluidsynth,FluidSynth/fluidsynth,nezticle/fluidsynth,nezticle/fluidsynth