Fix windows build

git-svn-id: https://bucket.mit.edu/svn/nilm/acquisition/ethstream@9685 ddd99763-3ecb-0310-9145-efcb8ce7c51f

ethstream.c

@@ -457,8 +457,10 @@ int main(int argc, char *argv[])
 	signal(SIGINT, handle_sig);
 	signal(SIGTERM, handle_sig);
 
+#ifdef SIGPIPE /* not on Windows */
 	/* Ignore SIGPIPE so I/O errors to the network device won't kill the process */
 	signal(SIGPIPE, SIG_IGN);
+#endif
 
 	if (detect) {
 		info("Autodetecting NerdJack address\n");