Set output name correctly for OS/2
Set output name correctly for OS/2

OS/2 has a DLL name length limit up to 8 characters.

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