remote: Don't reject remote polkit if client lacks support
    
    If you compile a client --without-polkit, and connect to a URI that needs
    polkit auth, the connection will fail with:
    
    $ ./tools/virsh --connect qemu+ssh://crobinso@machine/system
    error: failed to connect to the hypervisor
    error: authentication failed: unsupported authentication type 2
    
    This is because the client side portion of the polkit handling is
    compiled out. However, nothing polkit specific is actually required
    of the client.
    
    Fix that error by unconditionally compiling the basic polkit client
    handling.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=635529