[Buildroot] [PATCH v2 09/14] use select instead of depend for fftw package and fix DEPENDENCIES

[Joel Carlson]

On Wed, Dec 12, 2018 at 12:45 AM Gwenhael Goavec-Merou
<gwenj at trabucayre.com> wrote:
>
> From: Gwenhael Goavec-Merou <gwenhael.goavec-merou at trabucayre.com>
>
> Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou at trabucayre.com>

Reviewed-by: Joel Carlson <JoelsonCarl at gmail.com>
Tested-by: Joel Carlson <JoelsonCarl at gmail.com>

Testing: compile-tested a build of hackrf with all the permutations of
enabling/disabling fftw-single, fftw-double, and fftw-long-double on
an aarch64 build (so no fftw-quad available). Only built hackrf with
permutations where I wanted FFTW_SINGLE enabled, since it selects it.