compatibility on windows

[leejw51crypto]

libwasmvm, src, cache.rs, do_init_cache
let cache = unsafe { Cache::new(options) }?;

calls
cosmwasm vm/src/cache.rs

 for path in [&state_path, &cache_path, &wasm_path].iter() {
            create_dir_all(path).map_err(|e| {
                VmError::cache_err(format!(
                    "Error creating directory {}: {}",
                    path.display(),
                    e
                ))
            })?;
        }

path.display is different because of \\
and e is also different message on windows
this make CI test fails

check this pattern in other places,
ensure compatibility on windows