Merge topic branch t/wmadec into next

A few patches which remove unused code from the wma decoder and audio
format handler. Notably, noise coding was removed completely since
it was only used for unusual bit rates. Most likely, it never worked
in the first place.

Started on 2025-01-22

* refs/heads/t/wmadec:
  wmadec: Remove noise coding.
  wmadec: Simplify wma_init().
  wmadec: Remove fft().