package/docker-engine: add netcgo build tag

Force Docker Engine to use the C DNS resolver.

Fixes some issues related to the Go DNS resolver.

Signed-off-by: Christian Stewart <christian@aperture.us>

package/docker-engine/docker-engine.mk

@@ -23,7 +23,7 @@ DOCKER_ENGINE_LDFLAGS = \
  -X $(DOCKER_ENGINE_GOMOD)/dockerversion.InitCommitID="" \
  -X $(DOCKER_ENGINE_GOMOD)/dockerversion.Version="$(DOCKER_ENGINE_VERSION)"
 
-DOCKER_ENGINE_TAGS = cgo exclude_graphdriver_zfs
+DOCKER_ENGINE_TAGS = cgo netcgo exclude_graphdriver_zfs
 DOCKER_ENGINE_BUILD_TARGETS = cmd/dockerd cmd/docker-proxy
 
 ifeq ($(BR2_PACKAGE_LIBAPPARMOR),y)