cmake HAVE_CAMV4L2 examples

chsl/PLADE code/3rd_party/opencv/cmake/OpenCVFindLibsVideo.cmake :166 

CHECK_INCLUDE_FILE(linux/videodev2.h HAVE_CAMV4L2)

plumonito/dtslam 3rdparty/opencv-git/cmake/OpenCVFindLibsVideo.cmake :160 

CHECK_INCLUDE_FILE(linux/videodev2.h HAVE_CAMV4L2)

plumonito/dtslam 3rdparty/opencv-git/modules/videoio/CMakeLists.txt :74 

elseif(HAVE_CAMV4L OR HAVE_CAMV4L2 OR HAVE_VIDEOIO)

joachimBurket/esp32-opencv modules/videoio/cmake/detect_v4l.cmake :4 

check_include_file(linux/videodev2.h HAVE_CAMV4L2)

joachimBurket/esp32-opencv modules/videoio/cmake/detect_v4l.cmake :10 

list(APPEND defs "HAVE_CAMV4L2")

SsageParuders/Android_Native_Surface my_android_opencv/modules/videoio/cmake/detect_obsensor.cmake :21 

check_include_file(linux/videodev2.h HAVE_CAMV4L2)

SsageParuders/Android_Native_Surface my_android_opencv/modules/videoio/cmake/detect_v4l.cmake :4 

check_include_file(linux/videodev2.h HAVE_CAMV4L2)

SsageParuders/Android_Native_Surface my_android_opencv/modules/videoio/cmake/detect_v4l.cmake :10 

list(APPEND defs "HAVE_CAMV4L2")