cmake HAVE_DL_LIBRARY examples

SsageParuders/Android_Native_Surface my_android_opencv/3rdparty/ittnotify/CMakeLists.txt :14 

CHECK_LIBRARY_EXISTS(dl dlerror "" HAVE_DL_LIBRARY)

joachimBurket/esp32-opencv 3rdparty/ittnotify/CMakeLists.txt :14 

CHECK_LIBRARY_EXISTS(dl dlerror "" HAVE_DL_LIBRARY)