Change interface to bb_lookup_host, dont try and set port inside this

function as there is no gracefull way of handling failures.
Rename bb_getport to bb_lookup_port, allow a default port to be
specified so it always returns a correct value.
Modify ftpgetput/rdate/wget to use the new interface.
wget/rdate now use etc/services with a falback default value.

util-linux/rdate.c

@@ -50,7 +50,8 @@ static time_t askremotedate(const char *host)
 	struct sockaddr_in s_in;
 	int fd;
 
-	bb_lookup_host(&s_in, host, "time");
+	bb_lookup_host(&s_in, host);
+	s_in.sin_port = bb_lookup_port("time", 37);
 
 	/* Add a timeout for dead or non accessable servers */
 	alarm(10);