Remove unsafe libc layer

src/libstd/fs.rs

@@ -348,6 +348,16 @@ impl File {
             inner: self.inner.duplicate()?
         })
     }
+
+    /// Get the path that this file points to.
+    ///
+    /// This function is only implemented on Redox, but could be
+    /// implemented on other operating systems using readlink
+    #[cfg(redox)]
+    #[stable(feature = "rust1", since = "1.14.0")]
+    pub fn path(&self) -> io::Result<PathBuf> {
+        self.inner.path()
+    }
 }
 
 impl AsInner<fs_imp::File> for File {