configure: add missing library deps for showcqt_filter

Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -6084,6 +6084,7 @@ enabled sab_filter          && prepend avfilter_deps "swscale"
 enabled scale_filter    && prepend avfilter_deps "swscale"
 enabled scale2ref_filter    && prepend avfilter_deps "swscale"
 enabled sofalizer_filter    && prepend avfilter_deps "avcodec"
+enabled showcqt_filter      && prepend avfilter_deps "avformat avcodec swscale"
 enabled showfreqs_filter    && prepend avfilter_deps "avcodec"
 enabled showspectrum_filter && prepend avfilter_deps "avcodec"
 enabled smartblur_filter    && prepend avfilter_deps "swscale"