Bug#608336: exim4-base: Please change Suggests on libmail-spf-query-perl

[The Fungi]

Testing the invocation of spfquery.mail-spf-perl from your patch, it
appears that the --mfrom and --helo options imply mutually exclusive
modes of operation (or rather, --helo overrides --mfrom completely
when specified). The manpage also implies this, as well as stating
that --helo and --mfrom are deprecated in favor of --scope and
--identity options. As a result, an E-mail can have any
$sender_address the originating system wishes to spoof as long as
the $sender_helo_name uses a different domain. An additional
conditional is probably warranted, perhaps only checking with
--scope helo --identity \"$sender_helo_name\" when $sender_address
is empty.
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