Fix warnings from gcc 8.3 + musl build

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>

initd/main.c

@@ -51,7 +51,7 @@ retry:
 	memset(&rq, 0, sizeof(rq));
 	addrlen = sizeof(addr);
 	ret = recvfrom(sockfd, &rq, sizeof(rq), MSG_DONTWAIT | MSG_TRUNC,
-		       &addr, &addrlen);
+		       (struct sockaddr *)&addr, &addrlen);
 
 	if (ret < 0 && errno == EINTR)
 		goto retry;

lib/init/init_socket_create.c

@@ -2,6 +2,7 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
+#include <string.h>
 #include <stdio.h>
 
 #include "initsock.h"