Merge topic 'remove-dead-code'

6ce78cab vtkLineIntegralConvolution2D: conditionalize minmax impls
922d167a vtkMersenneTwister_Private: remove unused code
626e3f0e vtkMySQLQuery: remove unused function
9ac04e4a vtkPostgreSQLQuery: remove unused function
8f948197 vtkOpenVRRenderWindowInteractor: remove unused function
fb43d62e vtkTkRenderWidget: remove unused functions
26edc6fd vtkTkImageViewerWidget: remove unused functions
dde9482e vtkEqualizerContextItem: remove unused code
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11890