modules/nsid: fix linkage on some systems

This is my mistake.  I was convinced this line wasn't needed
and I deleted it before merging the module.
Apparently we still have some deficiencies in the build system,
but let's defer that to migration (to meson probably).
27 jobs for travis-ci in 0 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Build
canceled #192848
amd64 linux docker
build:clang:linux:amd64

00:00:00

canceled #192847
amd64 linux docker
build:linux:amd64

00:00:00

canceled #192849
amd64 linux docker allowed to fail
srpm

00:00:00

 
  Test
canceled #192857
amd64 linux docker
deckard:linux:amd64

canceled #192863
privileged
distro:epel-7

canceled #192862
privileged
distro:fedora-29

canceled #192856
docker
doc

canceled #192854
dind
docker:build

canceled #192855
amd64 linux docker
installcheck:linux:amd64

canceled #192858
amd64 linux docker
installcheck:valgrind:linux:amd64

canceled #192851
docker
lint:c

canceled #192852
docker allowed to fail
lint:clang-scan-build

canceled #192850
docker
lint:lua

canceled #192859
docker
osx:build

canceled #192861
amd64 linux docker
respdiff:iter:udp:linux:amd64

canceled #192853
amd64 linux docker
test:linux:amd64

canceled #192860
amd64 linux docker
test:linux:amd64:valgrind

 
  Respdiff
canceled #192864
respdiff
respdiff:fwd-tls6-kresd.udp6

canceled #192865
respdiff
respdiff:fwd-udp6-kresd.udp6

canceled #192869
respdiff
respdiff:fwd-udp6-unbound.tcp6

canceled #192870
respdiff
respdiff:fwd-udp6-unbound.tls6

canceled #192868
respdiff
respdiff:fwd-udp6-unbound.udp6

canceled #192867
respdiff
respdiff:iter.tls6

canceled #192866
respdiff
respdiff:iter.udp6

canceled #192871
respdiff
resperf:fwd-tls6.udp-asan

canceled #192872
respdiff
resperf:fwd-udp6.udp-asan

canceled #192873
respdiff
resperf:iter.udp-asan