audio/fasttracker2: Update to 1.63

Changes since v1.61

v1.63 - 24.01.2023
- For users with >60Hz displays: *hopefully* fixed possible slowdown/timing
  problems after leaving the program open for many hours.
- Windows/macOS: Updated SDL to v2.26.2

v1.62 - 28.11.2022
- Because of a bug in FT2, pattern loop commands will manipulate the row the
  next pattern will begin at (should be 0). However, this can overflow the
  number of rows (length) for that pattern and cause out-of-bounds reads. Set to
  row 0 in this case. This fixes for example "ambrozia.xm" in the transition
  from song end to song start.

(fox)