libc: open64_2

Needed by Node.js.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
libc: Add more _chk functions

Needed by Node.js.

Reviewed-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
libc: Stdio-based syslog

Needed by Node.js.

Reviewed-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>