bug#43314: vc-bzr-test-bug9726 test fails on master

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Stefan Kangas <stefan@marxist.se>,  43314@debbugs.gnu.org
> Date: Fri, 11 Sep 2020 11:39:53 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Well, maybe you should then report this problem to Debian.
> 
> Well, shouldn't Emacs also support brz?  

That's a separate issue.  The problem here was caused by brz
installing itself as bzr, but acting in (so it seems) an incompatible
ways.