Log Message:
audio/fasttracker2: Update to 1.87

Changes since 1.86:

v1.87 - 03.11.2024
- Fixed: Stereo FLAC samples with a bitdepth of 24 didn't import correctly
  if you chose to convert to mono.
- Added a Super Nintendo interpolation option ("Gaussian")
- Fixed wrong tuning when importing Gravis Ultrasound .PAT patch files
- Slightly improved the interpolation method for the tracker scopes in
  "Lined" mode
- Updated the help text to reflect the new interpolation option
- Windows/macOS: Updated SDL to v2.30.9
- Code cleanup