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src/spectral/fft.c: make calls to fftw_destroy_plan thread-safe

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

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

@@ -212,9 +212,11 @@

   /* destroy data */

   del_fvec(s->compspec);

 #ifdef HAVE_FFTW3             // using FFTW3

+  pthread_mutex_lock(&aubio_fftw_mutex);

   fftw_destroy_plan(s->pfw);

   fftw_destroy_plan(s->pbw);

   fftw_free(s->specdata);

+  pthread_mutex_unlock(&aubio_fftw_mutex);

 #else /* HAVE_FFTW3 */

 #ifdef HAVE_ACCELERATE        // using ACCELERATE

   AUBIO_FREE(s->spec.realp);