configure: remove selection of ff(a)buffersink.

buffersink is enabled unconditionally.

configure

@@ -2128,10 +2128,10 @@ swscale_deps="avutil"
 
 # programs
 ffmpeg_deps="avcodec avfilter avformat swscale swresample"
-ffmpeg_select="ffbuffersink_filter format_filter aformat_filter
-               setpts_filter null_filter anull_filter ffabuffersink_filter"
+ffmpeg_select="format_filter aformat_filter
+               setpts_filter null_filter anull_filter"
 ffplay_deps="avcodec avformat swscale swresample sdl"
-ffplay_select="ffbuffersink_filter rdft crop_filter"
+ffplay_select="rdft crop_filter"
 ffprobe_deps="avcodec avformat"
 ffserver_deps="avformat ffm_muxer fork rtp_protocol rtsp_demuxer"
 ffserver_extralibs='$ldl'