hints: fix linkage on darwin

It's not very nice that this symbol used in hints.so is defined in
sbin/kresd, but it touches the daemon structures and thus doesn't
really belong into libkres.
10 jobs for travis-osx in 7 minutes and 3 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #74194
amd64 linux docker
build:linux:amd64

00:04:40

passed #52553
docker linux amd64
build:linux:amd64

00:00:31

canceled #73039
amd64 linux docker
build:linux:amd64

canceled #73168
amd64 linux docker
build:linux:amd64

passed #73383
amd64 linux docker
build:linux:amd64

00:04:51

 
  Test
canceled #73252
amd64 linux docker
deckard:linux:amd64

passed #52557
docker linux amd64
respdiff:linux:amd64

00:02:22

passed #52554
docker linux amd64
test:linux:amd64

00:00:31

passed #52556
docker linux amd64
test:linux:amd64:valgrind

00:00:44

passed #52555
docker linux amd64
deckard:linux:amd64

00:03:34

 
Name Stage Failure
failed
build:linux:amd64 Build There is an unknown failure, please try again
HEAD is now at 9c728d0 Run respdiff CI in new docker image
Checking out d48658b5 as travis-osx...
Updating/initializing submodules recursively...
Synchronizing submodule url for 'modules/policy/lua-aho-corasick'
Synchronizing submodule url for 'tests/deckard'
Synchronizing submodule url for 'tests/deckard/contrib/libfaketime'
Synchronizing submodule url for 'tests/deckard/contrib/libswrap'
Submodule path 'tests/deckard': checked out '11278dd9604cab43c25b666dec424b2f4817076a'
ERROR: Job failed (system failure): Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?