Upstream fixes, located by juliank: https://github.com/ruby/ruby/commit/f234e6c3d3170f37508e214cdaef78d4b2584e5a https://github.com/ruby/ruby/commit/1e0b49a293d3792826c67b7e05c5fcbd09c9ea6e
- Bug#919516: ruby2.5 ftbfs in testing/unstable: certificat... Matthias Klose
- Bug#919516: Andreas Hasenack
