contrib: update libswrap to avoid problems with CMake 3.9

12 jobs for <span class="ref-name">fix_cmake_39</span> in 2 minutes and 11 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #35746
docker linux amd64
test:python2:comparative:kresd

00:01:07

passed #35743
docker linux amd64
test:python2:pep8

00:00:27

passed #35744
docker linux amd64
test:python2:pylint

00:01:01

passed #35745
docker linux amd64
test:python2:unittests

00:00:31

passed #35750
docker linux amd64
test:python3:comparative:kresd

00:01:17

passed #35765
docker linux amd64
test:python3:latest:kresd

00:00:54

passed #35747
docker linux amd64
test:python3:pep8

00:00:31

passed #35748
docker linux amd64
test:python3:pylint

00:01:05

passed #35753
docker linux amd64
test:python3:sanity:pdnsrecursor

00:00:33

passed #35752
docker linux amd64
test:python3:sanity:unbound

00:00:40

passed #35749
docker linux amd64
test:python3:unittests

00:00:35

failed #35751
docker linux amd64
test:python3:latest:kresd

00:01:05