Fix :meth:`datetime.datetime.strptime`, :meth:`datetime.date.strptime` as

well as :func:`time.strptime` (by modifying :class:`_strptime.TimeRE`) to

make ``%c`` and ``%x`` accept year number representations consisting of

fewer digits than the usual four or two. Thanks to that, certain

``strftime/strptime`` round trips (such as

``datetime.strptime(dt.strftime("%c"), "%c"))`` for ``dt.year`` less than

1000) no longer raise ``ValueError`` for some locales/platforms (this was

the case, e.g., on Linux -- for various locales, including

``C``/``C.UTF-8``).