Move all comments from /sbin/ldconfig %postun script
    
    rpmbuild passes all lines between %postun and next section (%files) to
    script body. Including comments. And /sbin/ldconfig does not skip
    comments and complains when upgrading perl-libs package:
    
    /sbin/ldconfig: relative path `1' used to build cache
    warning: %postun(perl-libs-4:5.26.0-397.fc27.x86_64) scriptlet failed, exit status 1
    
    We must keep the lines literally empty.