process: fix call process.reallyExit, vs., binding

Some user-land modules, e.g., nyc, mocha, currently rely on patching
process.reallyExit.

PR-URL: https://github.com/nodejs/node/pull/25655
Fixes: https://github.com/nodejs/node/issues/25650


Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>