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>

modules/mux/ogg.c

@@ -747,8 +747,12 @@ static block_t *OggCreateHeader( sout_mux_t *p_mux )
                 op.packetno = p_stream->i_packet_no++;
                 ogg_stream_packetin( &p_stream->os, &op );
 
-                p_og = OggStreamFlush( p_mux, &p_stream->os, 0 );
-                block_ChainAppend( &p_hdr, p_og );
+                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 );
             }
         }
         else if( p_stream->i_fourcc != VLC_CODEC_FLAC &&