For MSWin32 assume sscanf doesn't work

The module never runs properly on MSWin32 on cpan testers and we
get this error:

    - astSet: The attribute setting "system=MJD" is invalid for a TimeFrame.

suggesting the sscanf is not working. Experiment with switching to
the internal implementation and see if that fixes the problem.
Sync up with v8.0.0 config files

These aren't used by the Perl module but they are part of the
v8.0.0 distro so should be included for consistency.