[Python-3000] buildbots

["Martin v. Löwis"]

> So, an environment variable would be useful, but maybe there should also be
> a Python function available that calls set_error_mode().  sys.set_error_mode()?

Even though this would be somewhat lying - I'd put it into
msvcrt.set_error_mode. For the _CrtSet functions, one might
expose them as-is; they do belong to msvcrt, so the module
would be the proper place. For SetErrorMode, still put it
into msvcrt - it's at least Windows-specific.

Regards,
Martin