Make sdp_Start static since it is used nowhere outside

include/vlc_sout.h

@@ -219,7 +219,6 @@ VLC_EXPORT(void,                 sout_MethodRelease, (announce_method_t *) );
 /** SDP */
 
 VLC_EXPORT( char *, vlc_sdp_Start, ( vlc_object_t *obj, const char *cfgpref, const struct sockaddr *src, size_t srclen, const struct sockaddr *addr, size_t addrlen ) );
-VLC_EXPORT( char *, sdp_Start, (const char *name, const char *description, const char *url, const char *email, const char *phone, const struct sockaddr *orig, size_t origlen, const struct sockaddr *addr, size_t addrlen) );
 VLC_EXPORT( char *, sdp_AddMedia, (char **sdp, const char *type, const char *protocol, int dport, unsigned pt, vlc_bool_t bw_indep, unsigned bw, const char *rtpmap, const char *fmtp) );
 VLC_EXPORT( char *, sdp_AddAttribute, (char **sdp, const char *name, const char *fmt, ...) ATTRIBUTE_FORMAT( 3, 4 ) );
 

src/stream_output/sdp.c

@@ -86,6 +86,7 @@ static vlc_bool_t IsSDPString (const char *str)
 }
 
 
+static
 char *sdp_Start (const char *name, const char *description, const char *url,
                  const char *email, const char *phone,
                  const struct sockaddr *src, size_t srclen,