cpio: revert previous commit
    
    I have done a little bit of observation and that change is not as easy as it
    could look.
    
    Firstly - asking for %{_sbindir}/rmt is not OK because we have older systems
    like RHEL6- which has only /sbin/rmt and not /usr/sbin/rmt.  Secondly, I
    looked at some older debian system, and it does not have the /sbin/rmt (but
    has only /usr/sbin/rmt).
    
    Looking at star source code, star based utilities always try to look for
    /etc/rmt (which, btw seems to exist on all platforms).
    
    ~> For that ^^ reasons, I'm switching back to /etc/rmt
    
    This reverts commit 1518d48b252433e1e311be8866239ad0135b19bc
    
    Version: 2.11-20