fd_util: added O_NONBLOCK functions

Changed the wrappers for pipe(), socket(), accept().  On WIN32, this
does not work for pipe().

src/socket_util.c

@@ -103,7 +103,7 @@ socket_bind_listen(int domain, int type, int protocol,
 	int passcred = 1;
 #endif
 
-	fd = socket_cloexec(domain, type, protocol);
+	fd = socket_cloexec_nonblock(domain, type, protocol);
 	if (fd < 0) {
 		g_set_error(error, listen_quark(), errno,
 			    "Failed to create socket: %s", g_strerror(errno));