Remove unused if condition krb5 localauth plugin
    
    The plugin can be built on all supported versions of fedora.
    And it was removed also from upstream spec file.
    
    (cherry picked from commit 088151887a97a81618de742a8007ccef8be6a4da)
    (cherry picked from commit e89cb59c680504b89ab24500b48ab4841e664f8b)