I think the simple way to solve that without significant effort is to try to deprecate changed apis, comment in the header how to migrate to the new api, and remove this deprecated api after the next release.
It’s not always possible to keep the functionality, but we should at least try to not break the build of VTK customer when updating a minor version without previous deprecation warning.
That being said, having a builbot testing at least the build of ParaView would be awesome 
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