Add optional support for opus for FFmpeg

cmake/Modules/CopyMSVCBins.cmake

@@ -41,6 +41,10 @@ file(GLOB FFMPEG_BIN_FILES
 	"${FFMPEG_avcodec_INCLUDE_DIR}/../bin/zlib*.dll"
 	"${FFMPEG_avcodec_INCLUDE_DIR}/bin/libbz2*.dll"
 	"${FFMPEG_avcodec_INCLUDE_DIR}/bin/zlib*.dll"
+	"${FFMPEG_avcodec_INCLUDE_DIR}/../bin/libopus*.dll"
+	"${FFMPEG_avcodec_INCLUDE_DIR}/../bin/opus*.dll"
+	"${FFMPEG_avcodec_INCLUDE_DIR}/bin/libopus*.dll"
+	"${FFMPEG_avcodec_INCLUDE_DIR}/bin/opus*.dll"
 	"${FFMPEG_avutil_INCLUDE_DIR}/bin${_bin_suffix}/avutil-*.dll"
 	"${FFMPEG_avcodec_INCLUDE_DIR}/bin${_bin_suffix}/avcodec-*.dll"
 	"${FFMPEG_avformat_INCLUDE_DIR}/bin${_bin_suffix}/avformat-*.dll"