Unconditionally import vtkParallelMPIModule.h
There is no need to do this only if USE_STDARG is not defined and in fact leads to compiler errors if USE_STDARG is defined because VTKPARALLELMPI_EXPORT does not get defined.
Backport: paraview/release
There is no need to do this only if USE_STDARG is not defined and in fact leads to compiler errors if USE_STDARG is defined because VTKPARALLELMPI_EXPORT does not get defined.
Backport: paraview/release