vtkCompositePolyDataMapper2: include <algorithm> for std::max

Change-Id: I48c0bb972929e51945d9563088b8633f371fa64f
vtkCompositePolyDataMapper2: avoid a NULL dereference

Change-Id: I3c349342efd0be2c9b57f2754aab491324edbbbd
Merge topic 'include-algorithm-for-max' into master

ea87122f vtkCompositePolyDataMapper2: avoid a NULL dereference
f6777cd5 vtkCompositePolyDataMapper2: include <algorithm> for std::max