Debian packaging: prevent failure during clean

This changed was aleady shipped in Debian. Backporting it to our
packaging system.

Debian bug: #833926

Change-Id: Iaa63456db91e1e13abfd3b01e5885a98174749d2
Reviewed-by: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>
1 file changed