Use deref_pointer_as instead of deref_pointer

[geetanshjuneja]

Links to #3841.

This PR is still under progress.

[geetanshjuneja]

@RalfJung since libc isn't reliably available on Windows targets, I won't be able to get windows specificlayouts like this.libc_ty_layout("CONSOLE_SCREEN_BUFFER_INFO"). What should I do in this case?

[RalfJung]

Yeah CONSOLE_SCREEN_BUFFER_INFO is not in libc. It's a Windows API type. I'd say remove that one from the PR for now and open a Zulip thread; either we can find this type declaration somewhere else or we have to write some helpers to declare such struct types entirely ourselves.