Let the ffmpeg executable select the abuffersink filter.

configure

@@ -1764,7 +1764,7 @@ postproc_deps="gpl"
 # programs
 ffmpeg_deps="avcodec avfilter avformat swscale swresample"
 ffmpeg_select="buffersink_filter format_filter aformat_filter
-               setpts_filter null_filter anull_filter"
+               setpts_filter null_filter anull_filter abuffersink_filter"
 ffplay_deps="avcodec avformat swscale swresample sdl"
 ffplay_select="buffersink_filter rdft"
 ffprobe_deps="avcodec avformat"