Bug#287581: splitting ACLs

[Robert Millan]

Btw, wrt splitting ACL files, note that #378935 adds a new one
(25_exim4-config_check_mail).  I think some of the rules currently in
30_exim4-config_check_rcpt could be moved into this one, with the added
advantage that they would be performed earlier, saving time and bandwidth.

Some of them could even be moved to acl_smtp_helo, like local or remote IP-based
blacklists.

I can send a patch for either of that, if you like.

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Robert Millan

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