Revert "We need an additional dead_code disable, since Rust has gotten better about warnings recently"

This reverts commit 8026a1a.

Author: Kimundi

src/lazy_static.rs

@@ -108,15 +108,13 @@ macro_rules! lazy_static {
         #[allow(non_camel_case_types)]
         #[allow(dead_code)]
         pub struct $N {__private_field: ()}
-        #[allow(dead_code)]
         pub static $N: $N = $N {__private_field: ()};
     };
     (MAKE TY PRIV $N:ident) => {
         #[allow(missing_copy_implementations)]
         #[allow(non_camel_case_types)]
         #[allow(dead_code)]
         struct $N {__private_field: ()}
-        #[allow(dead_code)]
         static $N: $N = $N {__private_field: ()};
     };
     () => ()