cmake HAVE_OPENCV examples

dlstreamer/dlstreamer src/monolithic/inference_backend/pre_proc/opencv/CMakeLists.txt :11 

add_definitions(-DHAVE_OPENCV)

dlstreamer/dlstreamer src/monolithic/inference_backend/pre_proc/opencv_utils/CMakeLists.txt :11 

add_definitions(-DHAVE_OPENCV)

terzakig/sqpnp examples/CMakeLists.txt :20 

add_definitions(-DHAVE_OPENCV)