Remove unneeded includes from simplefilters.c
Remove unneeded includes from simplefilters.c

vapoursynth/vapoursynth,vapoursynth/vapoursynth,Kamekameha/vapoursynth,vapoursynth/vapoursynth,vapoursynth/vapoursynth,Kamekameha/vapoursynth,Kamekameha/vapoursynth,Kamekameha/vapoursynth