Require CMake 3.8 to build VTK-m.

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• f1e1a524 - Require CMake 3.8 to build VTK-m.

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This merge request has been queued for testing. Test results may be viewed on:

• CDash (master)
• Buildbot (master) (only visible from inside Kitware)

Branch-at-master: f1e1a524

@kmorel Here is the bump to CMake 3.8 and related changes.

+1

Do: merge

mentioned in commit 628dce82

merged