Revert "src: ignore GCC -Wcast-function-type for v8.h"

This reverts commit f21cf456 as this has
now been included in the V8 version being used.

PR-URL: https://github.com/nodejs/node/pull/35758
Refs: https://github.com/v8/v8/commit/f08cbfdc4051266e4200b6e26775d35307b1259b


Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>