Only override any and all if not defined

If any or all are already defined (because we're using a new version of
python) just link them inside "utils" rather than redefining them.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>