Cleaning out various dead wood found with -dead_strip

bignum.c: mptobytes now resides in dss.c
loginrec.c: remove lastlog code since it isn't used.
dbutil.c: removed obselete usingsyslog variable
channel.h: client channel type only defined for client compile
common-algo.c: s/rijndael/aes/

--HG--
extra : convert_revision : 411ea4e70506ecb0202376f94bcf2d330603d042

channel.h

@@ -118,7 +118,9 @@ void recv_msg_channel_eof();
 void common_recv_msg_channel_data(struct Channel *channel, int fd, 
 		circbuffer * buf);
 
+#ifdef DROPBEAR_CLIENT
 const struct ChanType clichansess;
+#endif
 
 #ifdef USING_LISTENERS
 int send_msg_channel_open_init(int fd, const struct ChanType *type);