Updated 2.4.6 with autocreate for those who need it

[Simon Matter]

I've just released an updated cyrus-imapd-2.4.6-3 RPM which includes
updated autocreate/autosievefolder patches from here
http://www.vx.sk/download/patches/cyrus-imapd/
I hope this is useful for those who want to upgrade to 2.4 and can't wait
until the auto* feature is implemented upstream - Bron, thanks for looking
into it _after_ moving your home and what else :)

The other change is that both proc/ and lock/ directories have been moved
to tmpfs. It's done by moving both to /dev/shm/cyrus_proc/ and
/dev/shm/cyrus_lock/ and I hope it won't make any issues.

Regards,
Simon