1.1.18-0.1.rc2 - Update for new upstream tarball
    
    ... for release candidate: Pacemaker-1.1.18-rc2,
    for full details, see included ChangeLog file or
    https://github.com/ClusterLabs/pacemaker/releases/tag/Pacemaker-1.1.18-rc2
    
    Fix check scriptlet so as to work properly also with rpm<4.14 (not strictly
    required since: https://github.com/rpm-software-management/rpm/pull/249,
    but pragmatically follow the upstream)
    
    Signed-off-by: Jan Pokorný <jpokorny@redhat.com>