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src/spectral/fft.c: use memcpy

--- a/src/spectral/fft.c

+++ b/src/spectral/fft.c

@@ -230,9 +230,13 @@

 void aubio_fft_do_complex(aubio_fft_t * s, fvec_t * input, fvec_t * compspec) {

   uint_t i;

+#ifndef HAVE_MEMCPY_HACKS

   for (i=0; i < s->winsize; i++) {

     s->in[i] = input->data[i];

   }

+#else

+  memcpy(s->in, input->data, s->winsize * sizeof(smpl_t));

+#endif /* HAVE_MEMCPY_HACKS */

 #ifdef HAVE_FFTW3             // using FFTW3

   fftw_execute(s->pfw);

 #ifdef HAVE_COMPLEX_H