prepare for updates xdmf3

rather than use a version of xdmf3 where cmake has been
tailored for VTK, use stock xdmf3 (which was changed to allow this)
and tell it how we want to build it

ThirdParty/xdmf3/CMakeLists.txt

 find_package(Boost REQUIRED)
 include_directories(${Boost_INCLUDE_DIRS})
+set(${vtk-module}_SYSTEM_INCLUDE_DIRS
+    ${Boost_INCLUDE_DIRS})
 
 vtk_module_third_party(xdmf3
   LIBRARIES vtkxdmf3
@@ -18,8 +20,24 @@ endif()
 
 #########################################################################
 # Set Xdmf build environment options the way VTK wants them
-
-#?
+set(REQUESTED_PYTHON_VERSION ${VTK_PYTHON_VERSION})
+set(XDMF_BUILD_CORE_ONLY OFF CACHE INTERNAL "")
+set(XDMF_BUILD_DOCUMENTATION OFF CACHE INTERNAL "")
+set(XDMF_BUILD_DSM OFF CACHE INTERNAL "")
+set(XDMF_BUILD_TESTING OFF CACHE INTERNAL "")
+set(XDMF_BUILD_UTILS OFF CACHE INTERNAL "")
+set(XDMF_LIBNAME "vtkxdmf3" CACHE INTERNAL "")
+set(XDMF_NO_REALPATH ON CACHE INTERNAL "")
+set(XDMF_WRAP_JAVA OFF CACHE INTERNAL "")
+set(XDMF_WRAP_PYTHON OFF CACHE INTERNAL "")
+set(HDF5_LIBRARIES ${vtkhdf5_LIBRARIES})
+set(HDF5_hdf5_LIBRARY_RELEASE ${vtkhdf5_LIBRARIES})
+set(HDF5_INCLUDE_DIRS ${vtkhdf5_INCLUDE_DIRS})
+set(HDF5_C_INCLUDE_DIR ${vtkhdf5_INCLUDE_DIRS})
+set(HDF5_FOUND TRUE)
+set(LIBXML2_LIBRARIES ${vtklibxml2_LIBRARIES})
+set(LIBXML2_INCLUDE_DIR ${vtklibxml2_INCLUDE_DIRS})
+set(LIBXML2_FOUND TRUE)
 
 #########################################################################
 # Setup cmake to pull the library into place as a vtk module