vtkInstallCMakePackageHelpers: hint embree when ospray is needed
This should fix the regression in ParaView on vall introduced in 04d75ec0 (from !5881 (merged)).
Backport: paraview/release
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This should fix the regression in ParaView on vall introduced in 04d75ec0 (from !5881 (merged)).
Backport: paraview/release