Remove `Copy` and `Clone` impls for `LocalInternedString`.
Remove `Copy` and `Clone` impls for `LocalInternedString`.

They aren't used.

aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust