src: ensure that fd 0-2 are valid on windows

Check that stdin, stdout and stderr are valid file descriptors on
Windows. If not, reopen them with 'nul' file.

Refs: https://github.com/nodejs/node/pull/875
Fixes: https://github.com/nodejs/node/issues/11656
PR-URL: https://github.com/nodejs/node/pull/11863


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>