Bug#932339: Building of test packages hangs in Lintian due to commit 789eb18b

[Dmitry Bogatov <KAction@debian.org>]

[2019-07-17 19:24] Felix Lechner <felix.lechner@lease-up.com>
> Hi,
>
> Updating from version 12.1.1 in testing to 12.2.2 breaks the build
> process for test packages in Lintian. The unstable pipelines on
> jenkins and Gitlab are failing.
>
> The command 't/bin/build-test-packages' in Lintian runs for a while
> but then hangs. Some of the processes that build test packages in
> parallel may not terminate. The command also stalled when using
> '--jobs=1'. I was unable to locate an error message.
>
> The issue is caused by commit 789eb18b, which was found through
> bisection.

This change can't hang debhelper -- it adds no loops. But it can cause
debhelper errorneously fail (see #932073).  This extra check was added
in 12.2. Maybe it matters.

But if this conjecture is true, it is strange that bisection found
789eb18b guilty, but not e5fc959, which produces even more erroneous
failures.
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