BuildRequires: drop rsh
    
    It was added historically so ./configure could detect where the
    rsh binary is installed.  Nowadays we anyway use secure shell by
    './configure RSH=/usr/bin/ssh' so it's been useless dep for quite
    some time.
    
    Originally added by rhbz#475950, commit 0f5146d11e22716a2d5ded7.
    
    Resolves: rhbz#1581716
    Version: 1.30-4