cattle-1.0 fails to cross build from source, because it fails running
the gtk-doc scanner. Fortunately, the documentation is split out into an
arch:all package, so running the gtk-doc scanner is not necessary.
Hence, I am suggesting to skip it entirely in arch-only builds. Using
reproducible builds, I verified that this change does not affect binary
artifacts. I'm attaching a patch for your convenience.

Helmut

I included this patch in
<https://salsa.debian.org/debian/cattle-1.0/-/merge_requests/3> (which
is mostly about #1118795).

     smcv