coccinelle: O_NDELAY → O_NONBLOCK

Apparently O_NONBLOCK is the modern name used in most documentation and
for most cases in our sources. Let's hence replace the old alias
O_NDELAY and stick to O_NONBLOCK everywhere.

src/shared/utmp-wtmp.c

@@ -330,7 +330,7 @@ static int write_to_terminal(const char *tty, const char *message) {
         assert(tty);
         assert(message);
 
-        fd = open(tty, O_WRONLY|O_NDELAY|O_NOCTTY|O_CLOEXEC);
+        fd = open(tty, O_WRONLY|O_NONBLOCK|O_NOCTTY|O_CLOEXEC);
         if (fd < 0 || !isatty(fd))
                 return -errno;