Try out using latest v8 version without patches

[DmySyz]

Currently core uses an old (8.9) v8 version. It also applies a couple of patches to the build tools but none of them look particularly necessary (except for including cstdint ). Using latest v8 version could make the build process much easier.

[juliusknorr]

When discussing with @chrip we were wondering what v8 is even used for. As cryptpad has a wasm build of the converter are we sure we actually need this for core functionality? Is it maybe something that could be disabled with reduced feature sets?

@wginolas do do you have any insights there?