Put .info files into section directories for convenience.
dovecot needs a user on 10.5, and so one will be created via passed-dovecot.
10.6 has a "_dovecot" user, so we'll use that on that OS version and have an obsolete placeholder for passwd-dovecot
Use a common patch, and switch the user name in the PatchScript.
Update revisions so that a) the package uses passwd-dovecot rather than passwd on 10.5, and b) a rebuild is forced on 10.6.