change windows struct def

src/meta/filetype.rs

@@ -7,9 +7,19 @@ use std::fs::Metadata;
 pub enum FileType {
     BlockDevice,
     CharDevice,
-    Directory { uid: bool },
-    File { uid: bool, exec: bool },
-    SymLink { is_dir: bool },
+    Directory {
+        uid: bool,
+    },
+    File {
+        uid: bool,
+        exec: bool,
+    },
+    #[cfg(unix)]
+    SymLink {
+        is_dir: bool,
+    },
+    #[cfg(windows)]
+    SymLink,
     Pipe,
     Socket,
     Special,