build: restore js2c direct dependency on config.gypi

PR-URL: https://github.com/nodejs/node/pull/23355
Fixes: https://github.com/nodejs/node/issues/23352


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>