windows: move ffmpeg bins to submodule

udpate ffmpeg to b1cbeabf5e4b3234e895a58bafa371bfb792baf0
enable ffmpeg on arm64

Source/Core/VideoCommon/FrameDump.cpp

@@ -69,9 +69,6 @@ void InitAVCodec()
   static bool first_run = true;
   if (first_run)
   {
-#if LIBAVCODEC_VERSION_MICRO >= 100 && LIBAVCODEC_VERSION_INT < AV_VERSION_INT(58, 9, 100)
-    av_register_all();
-#endif
     // TODO: We never call avformat_network_deinit.
     avformat_network_init();
     first_run = false;