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 38 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
manual #40200
allowed to fail manual
build:arch
passed #40196
build:asan

00:02:51

passed #40199
build:bionic

00:07:22

passed #40198
build:buster

00:07:10

passed #40197
build:stretch

00:07:37

passed #40195
build:ubsan

00:02:54