NetBSD supports:
- O_CLOEXEC
- accept4(2) like API with paccept(2)
NetBSD 8.0 will get compat accept4(2)
- SOCK_NONBLOCK
- SOCK_CLOEXEC
- dup3(2)
PR-URL: https://github.com/libuv/libuv/pull/1534
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>