Set origin fields to "*" if missing

Also determine if a message is from the server by if the host field has
been copied from the nick field.

EFNet sends NOTICEs with no origin during registration.

RFC 1459 has this to say:

> If the prefix is missing from the message, it is assumed to have
> originated from the connection from which it was received.

I suppose a more correct implementation would be to set the origin to
the hostname of the server, but we don't store that globally, so this
is good enough.

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