lavf: stop exporting internal functions

Except for those currently used by ffserver.
Signed-off-by: James Almer <jamrial@gmail.com>

Also left some others that seemed used by applications other than ffserver
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/libavformat.v

@@ -3,9 +3,6 @@ LIBAVFORMAT_$MAJOR {
                 #FIXME those are for ffserver
                 ff_inet_aton;
                 ff_socket_nonblock;
-                ff_mpegts_parse_close;
-                ff_mpegts_parse_open;
-                ff_mpegts_parse_packet;
                 ff_rtsp_parse_line;
                 ff_rtp_get_local_rtp_port;
                 ff_rtp_get_local_rtcp_port;
@@ -17,10 +14,7 @@ LIBAVFORMAT_$MAJOR {
                 ffurl_seek;
                 ffurl_size;
                 ffurl_write;
-                ffurl_protocol_next;
                 #those are deprecated, remove on next bump
                 url_feof;
-                get_*;
-                ff_codec_get_id;
         local: *;
 };