Log Message:
schismtracker: update to 20221020.

Summary of changes since 20220905 release:

- Fix duplicated key input in pattern editor, order list, and instrument
  editor note table
- Respect audio-related SDL environment variables if set
- Fix handling of window width and height config file options
- Fix segfault on Wayland and DRM/KMS
- Hint SDL not to disable window manager compositing
- Add 4:3 aspect ratio config file option (want_fixed)

Summary of changes since 20220807 release:

- Fix crash in pattern editing introduced by SDL2 changes
- Fix displayed version number for Windows build

Summary of changes since 20220506 release:

- Use SDL2 instead of SDL1.2. This fixes various platform-dependent issues
  with video code, adds support for new audio drivers such as JACK, and
  removes the System Configuration video driver choices in favor of video
  scaling method selection.
- Fix multitrack mono audio export.
- Support ADPCM and stereo samples in XM files.