extract out runtime-codec to a separate crate

substrate/executor/src/lib.rs

@@ -27,6 +27,7 @@
 
 #![warn(missing_docs)]
 
+extern crate polkadot_runtime_codec as codec;
 extern crate polkadot_primitives as primitives;
 extern crate polkadot_serializer as serializer;
 extern crate polkadot_state_machine as state_machine;

substrate/executor/src/native_executor.rs

@@ -41,8 +41,8 @@ impl CodeExecutor for NativeExecutor {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use native_runtime::codec::KeyedVec;
-	use native_runtime::support::{TestExternalities, one, two, StaticHexInto};
+	use codec::KeyedVec;
+	use native_runtime::support::{one, two, TestExternalities, StaticHexInto};
 	use native_runtime::runtime::staking::balance;
 	use primitives::twox_128;
 

substrate/executor/src/wasm_executor.rs

@@ -280,8 +280,8 @@ mod tests {
 	use rustc_hex::FromHex;
 	use primitives::{blake2_256, twox_128};
 	use runtime_std;
+	use codec::KeyedVec;
 	use native_runtime::support::{one, two, StaticHexInto, TestExternalities};
-	use native_runtime::codec::KeyedVec;
 	use native_runtime::runtime::staking::balance;
 
 	#[test]