Remove unused ROOT_INCLUDE_DIR from CMakeLists.txt
Remove unused ROOT_INCLUDE_DIR from CMakeLists.txt

For dependent projects like roottest and rootbench, the file
ROOTConfig.cmake from the build directory should be enough to
export all necessary information.

olifre/root,karies/root,root-mirror/root,karies/root,olifre/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,olifre/root,karies/root,root-mirror/root,karies/root,karies/root,olifre/root