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

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: stefan@marxist.se,  43314@debbugs.gnu.org
> Date: Fri, 11 Sep 2020 12:31:58 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> 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.
> 
> I'm just saying

And I said "maybe", which means it was a suggestion.  So if people
disagree, there's no need to argue, just do what you think is best.

If we want to fix the test, then the first step would be to understand
what does brz do differently in this scenario.