Bug#908072: diffoscope: `bin/diffoscope --list-debian-substvars` output depends on installed packages

[Mattia Rizzolo]

Package: diffoscope
Version: 99
Severity: important

`bin/diffoscope --list-debian-substvars` depends on installed packages.

In particular, it seems "gnupg" and "rpm2cpio" are not printed if they
are not installed.
This makes d/rules generate differing d/tests/control whether the
package is built with nocheck or not.

This accidentally caused the FTBFS of version 100 (about to be
reported).

-- 
regards,
                        Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18  4D18 4B04 3FCD B944 4540      .''`.
more about me:  https://mapreri.org                             : :'  :
Launchpad user: https://launchpad.net/~mapreri                  `. `'`
Debian QA page: https://qa.debian.org/developer.php?login=mattia  `-
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