Drop legacy %post chmod /etc/sudoers
    
    The RPM permissions have been set at `0440` for a long, long time.  This
    `%post` invocation dates beyond the import from CVS in 2004.  Further,
    this change will actually *undo* local admin changes to use e.g. `0600`
    or something if they want to harden it further.
    
    This is similar to: https://src.fedoraproject.org/rpms/nfs-utils/pull-request/1
    I'm just making this change as it shows up as error spew when doing
    `rpm-ostree compose tree`.