added build stuff for kube-dns

hack/lib/golang.sh

@@ -30,6 +30,7 @@ fi
 # kube::build::source_targets in build/common.sh as well.
 kube::golang::server_targets() {
   local targets=(
+    cmd/kube-dns
     cmd/kube-proxy
     cmd/kube-apiserver
     cmd/kube-controller-manager
@@ -159,6 +160,7 @@ readonly KUBE_ALL_BINARIES=("${KUBE_ALL_TARGETS[@]##*/}")
 readonly KUBE_STATIC_LIBRARIES=(
   kube-apiserver
   kube-controller-manager
+  kube-dns
   kube-scheduler
   kube-proxy
   kubectl