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swig/aubio.i: add aubio_zero_crossing_rate to interface

--- a/swig/aubio.i

+++ b/swig/aubio.i

@@ -145,6 +145,7 @@

 uint_t aubio_silence_detection(fvec_t * ibuf, smpl_t threshold);

 smpl_t aubio_level_detection(fvec_t * ibuf, smpl_t threshold);

 void aubio_autocorr(fvec_t * in, fvec_t * acf);

+smpl_t aubio_zero_crossing_rate(fvec_t * input);

 /* scale */

 extern aubio_scale_t * new_aubio_scale(smpl_t flow, smpl_t fhig, smpl_t ilow, smpl_t ihig	);