Fix bug 427

Depending on the user installation, the compiled library will have missing symbols. e.g. Manjaro/Linux, VTK-7.1:

ImportError: /home/user/gdcm-2.6.8/build/bin/libvtkgdcm.so.2.6: undefined symbol: _Z40vtkFiltersParallelDIY2_AutoInit_Destructv

It can even crash when trying to execute from libvtkgdcmPython import *

Utilities/VTK/CMakeLists.txt

@@ -78,6 +78,7 @@ else()
     vtkRenderingCore
     vtkRenderingFreeType
     vtkRenderingFreeTypeOpenGL
+    vtkFiltersParallelDIY2
   )
   if(("${VTK_MAJOR_VERSION}" EQUAL 6) OR ("${VTK_RENDERING_BACKEND}" STREQUAL "OpenGL"))
     list(APPEND vtkgdcm_COND_LIBS vtkRenderingOpenGL)