Merge pull request #220 from jgilchrist/remove-lint

Remove the raw_pointer_derive lint which no longer exists

tcod_sys/lib.rs

@@ -1,5 +1,5 @@
 #![allow(non_camel_case_types, non_snake_case, non_upper_case_globals,
-         missing_copy_implementations, raw_pointer_derive)]
+         missing_copy_implementations)]
 // This is not added by rust-bindgen even though it's used heavily in the
 // generated code:
 extern crate libc;