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 Name Job ID Coverage
  Test
manual build:arch #40200
allowed to fail manual
passed build:asan #40196

00:02:51

passed build:bionic #40199

00:07:22

passed build:buster #40198

00:07:10

passed build:stretch #40197

00:07:37

passed build:ubsan #40195

00:02:54