Support use with bindgen-generated types

In particular, many generated types include the generic [`__IncompleteArrayField` type](https://rust-lang.github.io/rust-bindgen/using-fam.html#__incompletearrayfield), which causes annoyance for our users. Often they have to manually (or programmatically) edit the output of bindgen or add manual impls of zerocopy traits for `__IncompleteArrayField`.

cc @kupiakos