[Dovecot] patch for ssl_prefer_server_ciphers in dovecot 2.1

[Adi Kriegisch]

Dear all,

> I tried to do a backport of 'ssl_prefer_server_ciphers'
> (http://hg.dovecot.org/dovecot-2.2/rev/897484f45a87/) to Dovecot 2.1
[...]
> (Dovecot code is probably the most beautiful and easy to read C code I've
> seen, but there might also be some pitfalls I missed.)
I'd be very grateful, if someone could have a closer look at the patch and
see wether I missed something.

best regards,
    Adi Kriegisch