non BOS headers for (Vorbis, Theora, Speex, Kate) do not have to be on...

non BOS headers for (Vorbis, Theora, Speex, Kate) do not have to be on separate pages, so avoid flushing before the last header
Signed-off-by: Laurent Aimar <fenrir@videolan.org>
(cherry picked from commit f87986e4)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/mux/ogg.c

@@ -747,7 +747,11 @@ static block_t *OggCreateHeader( sout_mux_t *p_mux )
                 op.packetno = p_stream->i_packet_no++;
                 ogg_stream_packetin( &p_stream->os, &op );
 
+                if( j == 0 )
                     p_og = OggStreamFlush( p_mux, &p_stream->os, 0 );
+                else
+                    p_og = OggStreamPageOut( p_mux, &p_stream->os, 0 );
+                if( p_og )
                     block_ChainAppend( &p_hdr, p_og );
             }
         }