Removing wasm unused import warnings (#9492)

* Removing wasm unused import warnings

* cargo fmt

substrate/primitives/authorship/src/lib.rs

@@ -21,7 +21,9 @@
 
 use sp_std::{prelude::*, result::Result};
 
-use codec::{Decode, Encode};
+#[cfg(feature = "std")]
+use codec::Decode;
+use codec::Encode;
 use sp_inherents::{Error, InherentData, InherentIdentifier, IsFatalError};
 use sp_runtime::{traits::Header as HeaderT, RuntimeString};
 

substrate/primitives/npos-elections/src/assignments.rs

@@ -18,6 +18,7 @@
 //! Structs and helpers for distributing a voter's stake among various winners.
 
 use crate::{Error, ExtendedBalance, IdentifierT, PerThing128, __OrInvalidIndex};
+#[cfg(feature = "std")]
 use codec::{Decode, Encode};
 use sp_arithmetic::{
 	traits::{Bounded, Zero},