conftest: Drop unneeded declaration

Fixes build [1]

• [1] https://jenkins.softwareheritage.org/job/DENV/job/tests/lastBuild/artifact/swh-core.log

Test Plan

tox

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Migrated from D4351 (view on Phabricator)

Merge request was accepted

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Patch application report for D4351 (id=15387)

Rebasing onto 0796ac6c...

Current branch diff-target is up to date.

Changes applied before test

commit eefe1b633631db19e8a09e225666e8c0ae0b0d4e
Author: Antoine R. Dumont (@ardumont) <ardumont@softwareheritage.org>
Date:   Fri Oct 23 17:45:47 2020 +0200

    conftest: Drop unneeded declaration
    
    Fixes build [1]
    
    - [1] https://jenkins.softwareheritage.org/job/DENV/job/tests/lastBuild/artifact/swh-core.log

See https://jenkins.softwareheritage.org/job/DCORE/job/tests-on-diff/118/ for more details.

Merge request was merged

closed