BSE: slightly inflate fft W-coefficient arrays to please g++-7.2
BSE: slightly inflate fft W-coefficient arrays to please g++-7.2

Inflate coefficient arrays to avoid temporary negative array indexes.

Signed-off-by: Tim Janik <6ec6ff229c4e1c5bbd5933ee92e6c5832ff023bb@gnu.org>

tim-janik/beast,swesterfeld/beast,swesterfeld/beast,swesterfeld/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast