fdo#82144 fix unpacking of additional tarballs

Change-Id: I74a61005fa9534b3f96cd392c6e38c54c5fd35e1
(cherry picked from commit 0ad5604c91cdd593739b4af5dd3168d9b23b016b)
Reviewed-on: https://gerrit.libreoffice.org/11783
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>