configure: Remove unnecessary vf_spp->fft dependency

The AVDCT API used by this filter does in no way depend
upon the FFT subsystem.

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

configure

@@ -3809,7 +3809,7 @@ smartblur_filter_deps="gpl swscale"
 sobel_opencl_filter_deps="opencl"
 sofalizer_filter_deps="libmysofa"
 spp_filter_deps="gpl avcodec"
-spp_filter_select="fft idctdsp fdctdsp me_cmp pixblockdsp"
+spp_filter_select="idctdsp fdctdsp me_cmp pixblockdsp"
 sr_filter_deps="avformat swscale"
 sr_filter_select="dnn"
 stereo3d_filter_deps="gpl"