Rust 2018 cleanup

programs/native/storage/src/lib.rs

@@ -2,14 +2,11 @@
 //!  Receive mining proofs from miners, validate the answers
 //!  and give reward for good proofs.
 
-#[macro_use]
-extern crate log;
-#[macro_use]
-extern crate solana_sdk;
-
+use log::*;
 use solana_sdk::account::KeyedAccount;
 use solana_sdk::native_program::ProgramError;
 use solana_sdk::pubkey::Pubkey;
+use solana_sdk::solana_entrypoint;
 use solana_sdk::storage_program::*;
 
 solana_entrypoint!(entrypoint);