vtkOSPRayCache: install the header
It isn't meant to be wrapped as it is not a vtkObject. It is also
indicated as "internal" in its header comment, but is included from
other headers, so it needs installed.
Fixes: #18193 (closed)
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It isn't meant to be wrapped as it is not a vtkObject. It is also
indicated as "internal" in its header comment, but is included from
other headers, so it needs installed.
Fixes: #18193 (closed)