Add "cross" to the "test" Makefile target

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)

Makefile

@@ -35,7 +35,7 @@ docs-release: docs-build
 	$(DOCKER_RUN_DOCS) "$(DOCKER_DOCS_IMAGE)" ./release.sh
 
 test: build
-	$(DOCKER_RUN_DOCKER) hack/make.sh binary test-unit test-integration test-integration-cli
+	$(DOCKER_RUN_DOCKER) hack/make.sh binary cross test-unit test-integration test-integration-cli
 
 test-unit: build
 	$(DOCKER_RUN_DOCKER) hack/make.sh test-unit