cmake HAVE_VFW examples

chsl/PLADE code/3rd_party/opencv/cmake/OpenCVFindLibsVideo.cmake :7 

try_compile(HAVE_VFW
    "${OpenCV_BINARY_DIR}"
    "${OpenCV_SOURCE_DIR}/cmake/checks/vfwtest.cpp"
    CMAKE_FLAGS "-DLINK_LIBRARIES:STRING=vfw32")

plumonito/dtslam 3rdparty/opencv-git/cmake/OpenCVFindLibsVideo.cmake :7 

try_compile(HAVE_VFW
    "${OpenCV_BINARY_DIR}"
    "${OpenCV_SOURCE_DIR}/cmake/checks/vfwtest.cpp"
    CMAKE_FLAGS "-DLINK_LIBRARIES:STRING=vfw32")