Function derive_unaligned_enum 

pub(crate) fn derive_unaligned_enum(
    ast: &DeriveInput,
    enm: &DataEnum,
    zerocopy_crate: &Path,
) -> Result<TokenStream, Error>

An enum is Unaligned if:

• No repr(align(N > 1))
• repr(u8) or repr(i8)