src: remove ignore GCC -Wcast-function-type for v8

This reverts Commit 3ff2aece ("src:
ignore GCC -Wcast-function-type for v8.h") and Commit
2462a2c5 ("src: fix ignore GCC
-Wcast-function-type for older compilers") as this has
now been included in the V8 version being used.

PR-URL: https://github.com/nodejs/node/pull/35768
Refs: https://github.com/v8/v8/commit/f08cbfdc4051266e4200b6e26775d35307b1259b


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>