Drop some bits from libotutil that are now merged in libgsystem

src/libotutil/ot-gio-utils.h

@@ -42,21 +42,8 @@ GFile *ot_gfile_get_child_strconcat (GFile *parent, const char *first, ...) G_GN
 
 GFile *ot_gfile_get_child_build_path (GFile *parent, const char *first, ...) G_GNUC_NULL_TERMINATED;
 
-const char *ot_gfile_get_path_cached (GFile *file);
-
-const char *ot_gfile_get_basename_cached (GFile *file);
-
 gboolean ot_gfile_ensure_directory (GFile *dir, gboolean with_parents, GError **error);
 
-gboolean ot_gfile_rename (GFile          *src,
-                          GFile          *dest,
-                          GCancellable   *cancellable,
-                          GError        **error);
-
-gboolean ot_gfile_unlink (GFile          *path,
-                          GCancellable   *cancellable,
-                          GError        **error);
-
 gboolean ot_gfile_load_contents_utf8 (GFile         *file,
                                       char         **contents_out,
                                       char         **etag_out,