Revert "tools: simplify tools/doc/addon-verify.js"

This reverts commit c6682636.

Reverted along with d9b59def as this breaks compilation from
downloadable source tarballs.

Ref: https://github.com/nodejs/node/pull/17407
PR-URL: https://github.com/nodejs/node/pull/18287


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>