cmake HAVE_FFMPEG_MAX_ANALYZE_DURATION2 examples

phdsky/ORBSLAM24Windows Thirdparty/Pangolin/CMakeModules/FindFFMPEG.cmake :60 

CHECK_CXX_SOURCE_COMPILES(
     "#include \"${AVCODEC_INCLUDE_DIR}/libavformat/avformat.h\"
      int main() {
        sizeof(AVFormatContext::max_analyze_duration2);
      }" HAVE_FFMPEG_MAX_ANALYZE_DURATION2
   )