Remove old attributes

#![feature(unsafe_destructor, core, old_io, std_misc, libc, old_path)]

#![crate_name="openssl"]

#![crate_type="rlib"]

#![crate_type="dylib"]

#![doc(html_root_url="https://sfackler.github.io/rust-openssl/doc/openssl")]

extern crate libc;