Bug#848063: ri-li: FTBFS for unknown reasons

[Santiago Vila]

found 848063 2.0.1+ds-6
thanks

I tried to build this version 100 times, and it failed 94 times.
All build logs (both failed and successful) are available here:

https://people.debian.org/~sanvila/build-logs/ri-li/

This also fails in the reproducible builds autobuilders, which AFAIK
are not single-CPU:

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ri-li.html

Thanks.