tests: Assert that capsule-capture-libs --library-knowledge works

Signed-off-by: Simon McVittie <smcv@collabora.com>
6 jobs for cmp-by-elf in 7 minutes and 55 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
manual #40093
allowed to fail manual
build:arch
passed #40089
build:asan

00:03:21

passed #40092
build:bionic

00:07:54

passed #40091
build:buster

00:07:36

passed #40090
build:stretch

00:07:27

passed #40088
build:ubsan

00:03:06