configure: prepend avfilter_deps for *_rect filters

Found-by: ubitux
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -5600,9 +5600,11 @@ enabled amovie_filter       && prepend avfilter_deps "avformat avcodec"
 enabled aresample_filter    && prepend avfilter_deps "swresample"
 enabled asyncts_filter      && prepend avfilter_deps "avresample"
 enabled atempo_filter       && prepend avfilter_deps "avcodec"
+enabled cover_rect_filter   && prepend avfilter_deps "avformat avcodec"
 enabled ebur128_filter && enabled swresample && prepend avfilter_deps "swresample"
 enabled elbg_filter         && prepend avfilter_deps "avcodec"
 enabled fftfilt_filter      && prepend avfilter_deps "avcodec"
+enabled find_rect_filter    && prepend avfilter_deps "avformat avcodec"
 enabled mcdeint_filter      && prepend avfilter_deps "avcodec"
 enabled movie_filter    && prepend avfilter_deps "avformat avcodec"
 enabled pan_filter          && prepend avfilter_deps "swresample"