Thanks jujudusud for noticing and reporting it!

Upstream has added commits for fixing ffmpeg 5 compatibility but there is no new
release yet.

This package update switches to a git source and is pinned to the (current) git
HEAD commit, that includes said ffmpeg 5 fixes.

I've asked upstream for a new release in:
https://github.com/bmc0/dsp/issues/64

 - add it to ladspa-plugins groups
 - improve deps by adding sonames