remove obsolete config_win32.h from src/CMakeLists.txt
remove obsolete config_win32.h from src/CMakeLists.txt

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