Replace write() with send().

prrt/time-protocol.h

@@ -130,7 +130,7 @@ static inline ssize_t _send(socket_t conn, const char *buf, size_t size)
             printf("Select failed: %d.\n", errno);
             return -1;
         } else if (retval > 0) {
-            n = send(conn, buf, size - written, 0);
+            n = write(conn, buf, size - written);
             if (n < 0) {
                 _time();
                 printf("SEND FAILED: %ld, errno: %d, written: %ld / %lu\n", n, errno, written, size);