Bump bind-dyndb-ldap version for F18
    
    bind-dyndb-ldap with SOA serial autoincrement was released. Bump
    the package version in the spec file. The version is bumped for
    F18 only as it was released only to rawhide and we don't want to
    break development on F17.
    
    https://fedorahosted.org/freeipa/ticket/2554