Enforce non-blocking sendto(). The kernel sources show that there should be no
reason for blocking here but some users occasionally observe a blocked process
when sending to unreachable remote servers.

--- ./sysklogd/syslogd-flx24.c	2015-12-31 10:12:02.519648834 +0100
+++ ./sysklogd/syslogd.c	2015-12-31 10:24:27.923847008 +0100
@@ -425,6 +425,10 @@
 		bb_error_msg("cannot create socket");
 	}
 
+	if (fcntl(remotefd, F_SETFL, O_NONBLOCK) < 0) {
+		bb_perror_msg_and_die("Couldn't make UDP remote socket non-blocking");
+	}
+
 	remoteaddr.sin_family = AF_INET;
 	remoteaddr.sin_addr = *(struct in_addr *) *(xgethostbyname(RemoteHost))->h_addr_list;
 	remoteaddr.sin_port = htons(RemotePort);
@@ -501,7 +505,7 @@
 			/* send message to remote logger */
 			while ((now-- > 0) &&
 			       ( -1 == sendto(remotefd, line, strlen(line),
-			                      MSG_NOSIGNAL,
+			                      MSG_NOSIGNAL | MSG_DONTWAIT,
 			                      (struct sockaddr *) &remoteaddr,
 			                      sizeof(remoteaddr))) &&
 			       (errno == EINTR));