[Dovecot] Kerberos check logic incorrect

[Bryan Jacobs]

In configure.in, there is a check that does `krb5-config --version |
grep -v 1\.2`, making sure there is no "1.2" in the version of Kerberos
in use.  This is to prevent compiling against MIT Kerberos version 1.2,
which is too old for Dovecot.

Unfortunately for this idea, Heimdal 1.2.1 is out.  And Dovecot builds
fine against it.

Whoever committed this check also appears to have removed the comment
warning that it was broken, to add insult to injury.

Please fix your checks to be for FEATURES, not version numbers.  You
never know when something else that correctly implements the features
you want will come along.

Bryan Jacobs
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