[Pkg-emacsen-addons] Bug#877411: flycheck FTBFS and Debci failure with elpa-buttercup 1.9

[Adrian Bunk]

Source: flycheck
Version: 30-3
Severity: serious
Tags: buster sid

https://ci.debian.net/packages/f/flycheck/unstable/amd64/
https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/flycheck.html

...
Ran 91 specs, 42 failed, in 3.7 seconds.

dh_elpa_test: buttercup -L . returned exit code 255
debian/rules:4: recipe for target 'build' failed
make: *** [build] Error 255