Revert "src, tools: add debug symbols for node internals"

This reverts commit 446c1ecf.

Reverted for breaking `make test-v8`.  The "find all relevant system
headers" logic in `tools/gen-postmortem-metadata.py` needs more work.

Also reverts commit e46c3f74.
("tools: fix typo in gen-postmortem-metadata.py".)

PR-URL: https://github.com/nodejs/node/pull/17272
Refs: https://github.com/nodejs/node/pull/14901


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Matheus Marchini <matheusdot@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>