[VTK] VTKconfig.cmake contains absolute path to buildtree. 

e.g.:
```
  if (WIN32)
    set (VTK_RUNTIME_DIRS "D:/cgns/buildtrees/vtk/x64-windows-rel/bin")
  else ()
    set (VTK_RUNTIME_DIRS "D:/cgns/buildtrees/vtk/x64-windows-rel/lib")
  endif ()
```