Upgrade FFmpeg (5.0) for Windows 64-bit

Use FFmpeg win64 binaries from gyan.dev (referenced from ffmpeg.org):

 - https://www.gyan.dev/ffmpeg/builds/
 - https://ffmpeg.org/download.html#build-windows

Keep the old FFmpeg prebuilt binaries (4.3.1) for win32 builds.

Fixes #1753 <https://github.com/Genymobile/scrcpy/issues/1753>
Refs #1838 <https://github.com/Genymobile/scrcpy/pull/1838>
Refs #2583 <https://github.com/Genymobile/scrcpy/pull/2583>
PR #2952 <https://github.com/Genymobile/scrcpy/pull/2952>

Co-authored-by: Yu-Chen Lin <npes87184@gmail.com>
Co-authored-by: nkh0472 <nkh0472@hotmail.com>
Signed-off-by: Romain Vimont <rom@rom1v.com>

prebuilt-deps/prepare-dep

@@ -34,6 +34,9 @@ extract() {
     elif [[ "$file" == *.tar.gz ]]
     then
         tar xf "$file"
+    elif [[ "$file" == *.7z ]]
+    then
+        7z x "$file"
     else
         echo "Unsupported file: $file"
         return 1