fossology-nomossa is in our repository.
This is not enough as it is currently only referenced for stretch and jessie.
```
root@pergamon:/srv/softwareheritage/repository# reprepro ls fossology-nomossa
fossology-nomossa | 3.1-1~bpo8~swh+1 | jessie | amd64
fossology-nomossa | 3.1-1~bpo9~swh+1 | stretch-swh | amd64
```
We need it ported to buster.