remove warnings from makefile

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)

Makefile

@@ -3,7 +3,7 @@
 GIT_BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
 DOCKER_IMAGE := docker:$(GIT_BRANCH)
 DOCKER_DOCS_IMAGE := docker-docs:$(GIT_BRANCH)
-DOCKER_RUN_DOCKER := docker run -rm -i -t -privileged -e TESTFLAGS -v "$(CURDIR)/bundles:/go/src/github.com/dotcloud/docker/bundles" "$(DOCKER_IMAGE)"
+DOCKER_RUN_DOCKER := docker run --rm -i -t --privileged -e TESTFLAGS -v "$(CURDIR)/bundles:/go/src/github.com/dotcloud/docker/bundles" "$(DOCKER_IMAGE)"
 
 default: binary
 
@@ -17,10 +17,10 @@ cross: build
 	$(DOCKER_RUN_DOCKER) hack/make.sh binary cross
 
 docs: docs-build
-	docker run -rm -i -t -p 8000:8000 "$(DOCKER_DOCS_IMAGE)"
+	docker run --rm -i -t -p 8000:8000 "$(DOCKER_DOCS_IMAGE)"
 
 docs-shell: docs-build
-	docker run -rm -i -t -p 8000:8000 "$(DOCKER_DOCS_IMAGE)" bash
+	docker run --rm -i -t -p 8000:8000 "$(DOCKER_DOCS_IMAGE)" bash
 
 test: build
 	$(DOCKER_RUN_DOCKER) hack/make.sh test test-integration