fix: overlapping borrows on unix platforms

When cfg(unix), the `outpatj` meeded to last until the
`set_permissions` call, but it can't exist during the `io::copy`

examples/extract.rs

@@ -19,7 +19,7 @@ fn real_main() -> i32 {
     for i in 0..archive.len() {
         let mut file = archive.by_index(i).unwrap();
         let outpath = match file.name_as_child() {
-            Some(path) => path,
+            Some(path) => path.to_owned(),
             None => continue,
         };