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src/spectral/fft.c: use native fftw types, add warning if single fftw is used with aubio double

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

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

@@ -35,9 +35,12 @@

 #endif

 #if FFTW3F_SUPPORT

-#define real_t smpl_t

+#if !AUBIO_SINGLE_PRECISION 

+#warning "Using aubio in double precision with fftw3 in single precision"

+#endif

+#define real_t float 

 #else

-#define real_t lsmp_t

+#define real_t double 

 #endif

 struct _aubio_fft_t {