deps: V8: forward declaration of `Rtl*FunctionTable`

This should be semver-patch since actual invocation is version
conditional.

Backport-PR-URL: https://github.com/nodejs/node/pull/34356
PR-URL: https://github.com/nodejs/node/pull/32116


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>