Cleanup build warnings imports and unnecessary unsafe

lib/clif-backend/src/cache.rs

@@ -5,7 +5,7 @@ use std::sync::Arc;
 use wasmer_runtime_core::{
     backend::{sys::Memory, CacheGen},
     cache::{Artifact, Error},
-    module::{ModuleInfo, ModuleInner},
+    module::ModuleInfo,
     structures::Map,
     types::{LocalFuncIndex, SigIndex},
 };