Pristine tar 7.4.0

Christian Ehrhardtrequested to merge
paelzer-guest/libvirt:pristine-tar into pristine-tar

Usual GBP import along another MR that ensures 7.4 will build. Done via: gbp import-orig --pristine-tar -u 7.4.0 --debian-branch merge-7.4-Debian-experimental --upstream-branch upstream/latest --uscan

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