tail: fix -f for non-linux systems

src/uu/tail/src/tail.rs

@@ -1613,7 +1613,7 @@ impl WatcherExtTail for dyn Watcher {
     /// Wrapper for `notify::Watcher::watch` to also add the parent directory of `path` if necessary.
     fn watch_with_parent(&mut self, path: &Path) -> UResult<()> {
         let mut path = path.to_owned();
-        if path.is_file() {
+        if cfg!(target_os = "linux") && path.is_file() {
             /*
             NOTE: Using the parent directory instead of the file is a workaround.
             This workaround follows the recommendation of the notify crate authors: