put back the fftw requirement so that this works with the plain aalto master
put back the fftw requirement so that this works with the plain aalto master

lingsoft/AaltoASR,aalto-speech/AaltoASR,phsmit/AaltoASR,phsmit/AaltoASR,kkleino/AaltoASR,lingsoft/AaltoASR,kkleino/AaltoASR,kkleino/AaltoASR,lingsoft/AaltoASR,phsmit/AaltoASR,aalto-speech/AaltoASR,aalto-speech/AaltoASR,lingsoft/AaltoASR,kkleino/AaltoASR,lingsoft/AaltoASR,aalto-speech/AaltoASR,aalto-speech/AaltoASR,phsmit/AaltoASR,kkleino/AaltoASR