...beyond Pacemaker-1.1.14
(commit 5a6cdd1), but restore old-style notifications to the state at
Pacemaker-1.1.14 point release (disabled)
- Definitely get rid of Corsync v1 (Flatiron) hypothetical support
- Remove some of the spec file cruft, not required for years
(BuildRoot, AutoReqProv, "clean" scriptlet, etc.) and adapt the file
per https://github.com/ClusterLabs/pacemaker/pull/965