Log Message:
PC6001VX: update to 3.5.3.

Upstream changes:

3.5.3 2020/09/26
- Fixed screen flicker when using hardware acceleration.
- Added System Information dialog.
- (Android) better handling of external storage.
- (Android) Targetted at Android SDK 29.

3.5.2 2020/06/15 (released Android version only)
- (Android) Fixed file selection dialog to show files in external storage
  (again).
- (Android) Changed file/folder open operation in file selection dialog
  from double tap to single tap.