deps: sync V8 gypfiles with 7.1

Enable v8_enable_embedded_builtins.
Reorder conditions proccessing for `run_mksnapshot`.

deps,v8: link with `atomic` for platforms lacking CAS
Fixes: https://github.com/nodejs/node-v8/issues/81



Co-authored-by: Michaël Zasso <targos@protonmail.com>
PR-URL: https://github.com/nodejs/node/pull/23423


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Myles Borins <myles.borins@gmail.com>