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Revert ooura reverse fft scaling changes

... and adjusted new Intel IPP fft impls scaling accordingly as well

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

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

@@ -449,16 +449,16 @@

   // apply fft

   ippsFFTInv_CCSToR_64f((const Ipp64f *)s->complexOut, output->data, s->fftSpec, s->memBuffer);

   // apply scaling

-  ippsMulC_64f(output->data, 1.0 / s->winsize, output->data, s->fft_size);

+  ippsMulC_64f(output->data, 2.0 / s->winsize, output->data, s->fft_size);

 #else

   // apply fft

   ippsFFTInv_CCSToR_32f((const Ipp32f *)s->complexOut, output->data, s->fftSpec, s->memBuffer);

   // apply scaling

-  ippsMulC_32f(output->data, 1.0f / s->winsize, output->data, s->fft_size);

+  ippsMulC_32f(output->data, 2.0f / s->winsize, output->data, s->fft_size);

 #endif /* HAVE_AUBIO_DOUBLE */

 #else                         // using OOURA

-  smpl_t scale = 1.0 / s->winsize;

+  smpl_t scale = 2.0 / s->winsize;

   s->out[0] = compspec->data[0];

   s->out[1] = compspec->data[s->winsize / 2];

   for (i = 1; i < s->fft_size - 1; i++) {