[Dovecot] quota-dirsize and mailbox rules

[Thanos Chatziathanassiou]

I noticed that the dirsize backend for quota didn't support any rules 
and figured it should be easy enough to add ``ignore'' at least.
Using mbox storage and only tested with that, but it seems to work as 
expected for the time being.
I'm attaching a relatively small patch for quota-dirsize.c against 
dovecot-1.1.18 just in case anyone's interested.

Best Regards,
Thanos Chatziathanassiou

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