4 small items in this:

- when we don't have in_addr_t, use uint32.
- a forgotten initialization of slave_proxy_id in sql/log_event.cc (was not really "forgot", was
"we needn't init it there", but there was one case where we needed...).
- made slave_proxy_id always meaningful in THD and Log_event, so we can
rely more on it (no need to test if it's meaningful). THD::slave_proxy_id
is equal to THD::thread_id except for the slave SQL thread.
- clean up the slave's temporary table (i.e. free their memory) when slave
server shuts down.

libmysql/libmysql.c

@@ -1623,7 +1623,7 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
   char		buff[NAME_LEN+USERNAME_LENGTH+100],charset_name_buff[16];
   char		*end,*host_info,*charset_name;
   my_socket	sock;
-  uint32	ip_addr;
+  in_addr_t	ip_addr;
   struct	sockaddr_in sock_addr;
   ulong		pkt_length;
   NET		*net= &mysql->net;