ENH: Add module vtkInteractionStyle when needed.
ENH: Add module vtkInteractionStyle when needed.

If vtkRenderWindowInteractor is used then there is a
 dependency on vtkInteractionStyle.

Thanks to Bill Lorenson for finding this when testing
 http://review.source.kitware.com/#/c/13252/

Change-Id: I7f12d8948822c0b92b6a3237e63f9e674548246d
Signed-off-by: Andrew Maclean <c9b2f5a1dba95786ee62d836bcc66ea197719bbe@gmail.com>

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