src: restore stdio on program exit

Record the state of the stdio file descriptors on start-up and restore
them to that state on exit.  This should prevent issues where node.js
sometimes leaves stdio in raw or non-blocking mode.

Co-authored-by: Krzysztof Taborski <taborskikrzysztof@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/20592
Fixes: https://github.com/nodejs/node/issues/14752
Fixes: https://github.com/nodejs/node/issues/21020


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>