Milter-greylist

> > There is a problem with that patch: it violates the libmilter API. This says
> > that signals are to be handled by libmilter itself:
> > http://www.sendmail.org/doc/sendmail-current/libmilter/docs/overview.html
> > 

OK, attached an other patch, replacing the previous one.
This has absolutely no any reference to signal handling stuff.
BTW, by my opinion it is time now to update both the libmilter
code and documentation.

> Anyway, libmilter blocks the signals in the smfi_main() thread. The
> mask is inherited by all descendant threads. Libmilter does not catch
> the signals but picks them by sigwait().
>