Bug#885605: buzztrax: Drop Build-Depends on rarian-compat

[Jeremy Bicha]

Source: buzztrax
Version: 0.10.2.4
Severity: important
User: pkg-gnome-maintainers at lists.alioth.debian.org
Usertags: oldlibs rarian
Tags: sid buster patch

scrollkeeper has been deprecated and unmaintained for years. Its
replacement, rarian has been deprecated for years too. More
importantly, it doesn't seem to be needed at all. yelp can easily
display Docbook help files without any .omf files.

We do not intend to ship rarian in Debian 10 "Buster". Therefore,
please drop rarian-compat from buzztrax's Build-Depends.

I'm not actually attaching a patch, but the fix seems pretty trivial
here.

On behalf of the Debian GNOME team,
Jeremy Bicha