Revert "Minor cmake grammar fix"

It appears I was really wrong. Damn.

This reverts commit 277629f9fec069afce32a21fd6baeb4f24d5784c.
Let CMake rely on data's CMakeLists.txt if it exists

- Also update data to latest 'dev', where the CMakeLists exists
Merge pull request #114 from OdyX/dev-update-cmake-with-data

Let CMake rely on data's CMakeLists.txt if it exists