BUG: CMakeLists.txt used wrong DATA variable.

src/Cxx/DataStructures/CMakeLists.txt

src/Cxx/DataStructures/ModifiedBSPTree/CMakeLists.txt

src/Cxx/DataStructures/Octree/CMakeLists.txt

src/Cxx/Filtering/CMakeLists.txt

src/Cxx/IO/CMakeLists.txt

src/Cxx/Images/CMakeLists.txt

src/Cxx/InfoVis/CMakeLists.txt

src/Cxx/Interaction/CMakeLists.txt

src/Cxx/Medical/CMakeLists.txt

src/Cxx/Meshes/CMakeLists.txt

src/Cxx/Modelling/CMakeLists.txt

src/Cxx/Parallel/CMakeLists.txt

src/Cxx/Points/CMakeLists.txt

src/Cxx/PolyData/CMakeLists.txt

src/Cxx/Remote/CMakeLists.txt

src/Cxx/RenderMan/CMakeLists.txt

src/Cxx/StructuredPoints/CMakeLists.txt

src/Cxx/Texture/CMakeLists.txt

src/Cxx/Utilities/CMakeLists.txt

src/Cxx/Visualization/CMakeLists.txt