Enable policy optimization
    
    The new v3.0 SELInux userspace added support for optimizing the binary
    policy by pruning redundant rules from it. Enable it on Fedora by
    default, since it brings noticeable space savings and only negligibly
    increases policy build time.
    
    Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>