cmake HAVE_OPENCV_XFEATURES2D_NONFREE examples

lixiny/Handeye-Calibration-ROS src/handeye_calib_marker/CMakeLists.txt :63 

check_include_file_cxx(opencv2/xfeatures2d/nonfree.hpp HAVE_OPENCV_XFEATURES2D_NONFREE)

lixiny/Handeye-Calibration-ROS src/handeye_calib_marker/CMakeLists.txt :65 

add_definitions(-DHAVE_OPENCV_XFEATURES2D_NONFREE)