Remove libhistory check

According to GNU Readline developers, if we link with libreadline then
there is no need to link with libhistory at all.
49 jobs for master in 9 minutes and 29 seconds (queued for 12 seconds)
Status Job ID Name Coverage
  Image
passed #93529
dind allowed to fail
docker_centos-6-amd64

00:00:28

passed #93530
dind allowed to fail
docker_centos-7-amd64

00:00:28

passed #93519
dind allowed to fail
docker_debian-7-amd64

00:00:30

passed #93523
dind allowed to fail
docker_debian-7-i386

00:00:31

passed #93520
dind allowed to fail
docker_debian-8-amd64

00:00:31

passed #93524
dind allowed to fail
docker_debian-8-i386

00:00:23

passed #93521
dind allowed to fail
docker_debian-9-amd64

00:00:30

passed #93525
dind allowed to fail
docker_debian-9-i386

00:00:26

passed #93522
dind allowed to fail
docker_debian-testing-amd64

00:00:29

passed #93526
dind allowed to fail
docker_debian-testing-i386

00:00:25

passed #93527
dind allowed to fail
docker_fedora-25-amd64

00:00:26

passed #93528
dind allowed to fail
docker_fedora-26-amd64

00:00:27

passed #93531
dind allowed to fail
docker_opensuse-42_3-amd64

00:00:28

passed #93532
dind allowed to fail
docker_ubuntu-14_04-amd64

00:00:24

passed #93533
dind allowed to fail
docker_ubuntu-16_04-amd64

00:00:25

 
  Build
passed #93546
docker linux amd64
build-centos-6-amd64

00:00:50

passed #93547
docker linux amd64
build-centos-6-amd64-v6

00:01:03

passed #93548
docker linux amd64
build-centos-7-amd64

00:00:54

passed #93549
docker linux amd64
build-centos-7-amd64-v6

00:00:58

passed #93534
docker linux amd64
build-debian-7-amd64

00:00:34

passed #93538
docker linux amd64
build-debian-7-amd64-v6

00:01:21

passed #93556
docker linux amd64
build-debian-7-i386

00:01:21

passed #93557
docker linux amd64
build-debian-7-i386-v6

00:00:33

passed #93535
docker linux amd64
build-debian-8-amd64

00:00:30

passed #93539
docker linux amd64
build-debian-8-amd64-v6

00:01:22

passed #93558
docker linux amd64
build-debian-8-i386

00:00:39

passed #93559
docker linux amd64
build-debian-8-i386-v6

00:00:39

passed #93536
docker linux amd64
build-debian-9-amd64

00:00:32

passed #93540
docker linux amd64
build-debian-9-amd64-v6

00:01:30

passed #93560
docker linux amd64
build-debian-9-i386

00:00:37

passed #93561
docker linux amd64
build-debian-9-i386-v6

00:00:39

passed #93537
docker linux amd64
build-debian-testing-amd64

00:01:26

passed #93541
docker linux amd64
build-debian-testing-amd64-v6

00:01:27

passed #93562
docker linux amd64
build-debian-testing-i386

00:00:38

passed #93563
docker linux amd64
build-debian-testing-i386-v6

00:00:40

passed #93542
docker linux amd64
build-fedora-25-amd64

00:01:27

passed #93543
docker linux amd64
build-fedora-25-amd64-v6

00:00:57

passed #93544
docker linux amd64
build-fedora-26-amd64

00:00:57

passed #93545
docker linux amd64
build-fedora-26-amd64-v6

00:00:58

passed #93564
freebsd amd64
build-freebsd-11-amd64

00:07:46

passed #93565
freebsd amd64
build-freebsd-11-amd64-v6

00:07:47

passed #93566
freebsd i386
build-freebsd-11-i386

00:07:59

passed #93567
freebsd i386
build-freebsd-i386-v6

00:07:59

passed #93550
docker linux amd64
build-opensuse-42_3-amd64

00:00:58

passed #93551
docker linux amd64
build-opensuse-42_3-amd64-v6

00:00:59

passed #93552
docker linux amd64
build-ubuntu-14_04-amd64

00:01:00

passed #93553
docker linux amd64
build-ubuntu-14_04-amd64-v6

00:01:27

passed #93554
docker linux amd64
build-ubuntu-16_04-amd64

00:01:22

passed #93555
docker linux amd64
build-ubuntu-16_04-amd64-v6

00:01:27