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

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Thu, 10 Sep 2020 11:58:18 -0700
> Cc: 43314@debbugs.gnu.org
> 
> >> Test vc-bzr-test-bug9781 backtrace:
> >>   signal(error ("When applying VC operations to multiple files, the...
> >>   error("When applying VC operations to multiple files, the..." "/tmp/
> >
> > Doesn't happen here.
> >
> > Which version of bzr do you have installed?
> 
> $ bzr --version
> Breezy (brz) 3.1.0

This isn't bzr, that's brz, its evolving fork.  Maybe the test needs
to be adapted to brz?