buildsys: Fix shared lib build of ffserver.

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

configure

@@ -1677,7 +1677,7 @@ avconv_deps="avcodec avformat swscale"
 ffplay_deps="avcodec avformat swscale sdl"
 ffplay_select="buffersink_filter rdft"
 ffprobe_deps="avcodec avformat"
-ffserver_deps="avformat ffm_muxer fork rtp_protocol rtsp_demuxer !shared"
+ffserver_deps="avformat ffm_muxer fork rtp_protocol rtsp_demuxer"
 ffserver_extralibs='$ldl'
 ffmpeg_deps="avcodec avformat swscale swresample"
 ffmpeg_select="buffersink_filter"

libavformat/libavformat.v

@@ -10,6 +10,9 @@ LIBAVFORMAT_$MAJOR {
                 ff_rtp_get_local_rtp_port;
                 ff_rtp_get_local_rtcp_port;
                 ffio_open_dyn_packet_buf;
+                ffurl_close;
+                ffurl_open;
+                ffurl_write;
                 url_open;
                 url_close;
                 url_write;