Merge topic 'smtk-superbuild-marker'

848af648 ci: exclude test failing due to VTK's Python 3.8 support
ecc5dc58 smtk: pass the install dir to SMTK

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: David Thompson <david.thompson@kitware.com>
Merge-request: !726
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