remove unused code (#1920)

substrate/srml/support/procedural/src/storage/transformation.rs

@@ -226,11 +226,6 @@ fn decl_store_extra_genesis(
 		let typ = type_infos.typ;
 		if let Some(builder) = opt_build {
 			is_trait_needed = true;
-			let error_message = format!(
-				"Genesis parameters encoding of {} does not match the expected type ({:?}).",
-				name,
-				type_infos.value_type,
-			);
 			builders.extend(match type_infos.kind {
 				DeclStorageTypeInfosKind::Simple => {
 					quote!{{

substrate/srml/system/src/lib.rs

@@ -193,7 +193,9 @@ impl From<RawLog<substrate_primitives::H256>> for primitives::testing::DigestIte
 	}
 }
 
-// Create a Hash with 69 for each byte
+// Create a Hash with 69 for each byte,
+// only used to build genesis config
+#[cfg(feature = "std")]
 fn hash69<T: AsMut<[u8]> + Default>() -> T {
 	let mut h = T::default();
 	h.as_mut().iter_mut().for_each(|byte| *byte = 69);