Remove old feature raw_pointer_derive

[nox]

src/lib.rs:14:89: 14:107 warning: lint raw_pointer_derive has been removed: using derive with raw pointers is ok
src/lib.rs:14 #![allow(non_upper_case_globals, non_camel_case_types, non_snake_case, improper_ctypes, raw_pointer_derive)]
                                                                                                      ^~~~~~~~~~~~~~~~~~

[KiChjang]

Whoops, did this by mistake.