Fix libunwind native dep so Flatpak builds once again.

4 jobs for wip/flatpak-unwind-not-found in 12 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
canceled #57277
deb-package

00:00:09

canceled #57275
fedora

00:00:12

canceled #57278
flatpack-package

00:00:09

canceled #57276
ubuntu

00:00:10