message: ffmpeg/4.x: update FFmpeg wrapper 2021.06
  FFmpeg 4.4
  libvpx 1.10.0
diff: -# Binaries branch name: ffmpeg/master_20210303
  -# Binaries were created for OpenCV: 7ac6abe02a33bef445a5b77214ad31964e2c5cc1
  -ocv_update(FFMPEG_BINARIES_COMMIT "629590c3ba09fb0c8eaa9ab858ff13d3a84ca1aa")
  -ocv_update(FFMPEG_FILE_HASH_BIN32 "638065d5a0dab8a828879942375dcac4")
  -ocv_update(FFMPEG_FILE_HASH_BIN64 "7f10ae2e6a080ba3714f7a38ee03ae15")
  -ocv_update(FFMPEG_FILE_HASH_CMAKE "f8e65dbe4a3b4eedc0d2997e07c3f3fd")
  +# Binaries branch name: ffmpeg/master_20210608
  +# Binaries were created for OpenCV: eaa9228a4fdfb9c2465aea65a50ce2d16b55dce0
  +ocv_update(FFMPEG_BINARIES_COMMIT "213fcd5d4897319a83207406036c4a5957fba010")
  +ocv_update(FFMPEG_FILE_HASH_BIN32 "bab661341c30862fa88627130219c0a5")
  +ocv_update(FFMPEG_FILE_HASH_BIN64 "ac99f9767a83103c31709628af685924")
  +ocv_update(FFMPEG_FILE_HASH_CMAKE "8862c87496e2e8c375965e1277dee1c7")
  function(download_win_ffmpeg script_var)
  set(${script_var} "" PARENT_SCOPE)
  