Do not call fs::remove_file in cp_link_filtered_recurse

The target is removed by `copy_link` too, so no need to duplicate the syscall.

Author: Kobzol

src/bootstrap/src/lib.rs

@@ -1862,7 +1862,6 @@ impl Build {
                     self.create_dir(&dst);
                     self.cp_link_filtered_recurse(&path, &dst, &relative, filter);
                 } else {
-                    let _ = fs::remove_file(&dst);
                     self.copy_link(&path, &dst, FileType::Regular);
                 }
             }