add rustc and cargo to the main VLC docker images

So we don't have to build them each time as native tools.

While this is helpful, at least for rustup and cargo-c, the bookworm Rust version (1.63) is quite and doesn't know about Windows UCRT targets. So we will need to check the version of rust and in this case it won't be usable...

Also rustup and cargo are exclusive on Debian. Either you build your own toolchain or you use the system one. In our case the system one will likely not have the cross-compiled variants, so we will need to have rustup around.