Fix recv call (bug #336755), add some more includes.

--- a/ethloop.c	2002-05-03 15:13:20.000000000 +0200
+++ b/ethloop.c	2010-12-27 18:21:24.000000000 +0100
@@ -1,5 +1,7 @@
 /* vim: cin sw=4 ts=4
 */
+#include <arpa/inet.h> /* htons() */
+#include <sys/types.h> /* recv() */
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <sys/poll.h>
@@ -13,6 +15,7 @@
 #include <stdlib.h>
 #include <sys/time.h>
 #include <signal.h>
+#include <string.h>
 
 int sock;
 
@@ -133,9 +136,9 @@
 int recv_raw(int tmo)
 {
 	struct pollfd pf = {sock,POLLIN,0};
-	int r; unsigned short proto;
+	ssize_t r; unsigned short proto;
 	if(poll(&pf,1,tmo) <= 0) return 0;
-	r = recv(sock,&buf,1550,0);
+	r = recv(sock,&buf,sizeof(buf),0);
 	if (r <= 0) {
 		printf("error recv (%d)\n",r);
 		return 0;