Dockerfile: the aho-corasick module is now needed

... even if only building
10 jobs for fix-docker in 4 minutes and 41 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #74218
amd64 linux docker
build:linux:amd64

00:01:35

canceled #73211
amd64 linux docker
build:linux:amd64

passed #52679
docker linux amd64
build:linux:amd64

00:00:31

canceled #72960
amd64 linux docker
build:linux:amd64

failed #73378
amd64 linux docker
build:linux:amd64

00:01:24

 
  Test
canceled #73295
amd64 linux docker
deckard:linux:amd64

passed #52683
docker linux amd64
respdiff:linux:amd64

00:03:06

passed #52680
docker linux amd64
test:linux:amd64

00:00:27

passed #52682
docker linux amd64
test:linux:amd64:valgrind

00:00:37

passed #52681
docker linux amd64
deckard:linux:amd64

00:04:00

 
Name Stage Failure
failed
build:linux:amd64 Build There is an unknown failure, please try again
Running with gitlab-runner 10.1.0 (c1ecf97f)
on gitlab-ci.labs.nic.cz (e35b67ff)
Using Docker executor with image cznic/ubuntu:16.04 ...
Using docker image sha256:d2c6bc290aa78a095a94a399cf35b0e9c4fe70e9e2f41f767bace297dc61d3d9 for predefined container...
Pulling docker image cznic/ubuntu:16.04 ...
Using docker image cznic/ubuntu:16.04 ID=sha256:3ab862a7b85ee6bc3a3ee69ec249785a5ee8024e89cc1a9385b6ce756567953a for build container...
ERROR: Job failed (system failure): Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?