Merge topic 'ospray-windows-fixes'

ff234c1f vtkOSPRayVolumeMapperNode: remove needless parameter
cb2f36f1 vtkOSPRayRendererNode: fix brace initializers
ffd11114 vtkOSPRayRendererNode: include <algorithm> for std::min/max
5a96871a vtkOSPRayRendererNode: make M_PI available on Windows
e8d03b9c vtkOSPRayPass: avoid needless memory gymnastics
322f967c vtkOSPRayPass: avoid variable length stack arrays
f9bf9de4 vtkOSPRayPass: just use const char* up front

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1969
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