hack/make/go: update go.mk

Author: zchee

hack/make/go.mk

@@ -12,7 +12,7 @@ PKG := $(subst $(GO_PATH)/src/,,$(CURDIR))
 GO_PKGS := $(shell go list ./... | grep -v -e '.pb.go')
 GO_APP_PKGS := $(shell go list -f '{{if and (or .GoFiles .CgoFiles) (ne .Name "main")}}{{.ImportPath}}{{end}}' ${PKG}/...)
 GO_TEST_PKGS := $(shell go list -f='{{if or .TestGoFiles .XTestGoFiles}}{{.ImportPath}}{{end}}' ./...)
-GO_VENDOR_PKGS := $(shell go list -f '{{if and (or .GoFiles .CgoFiles) (ne .Name "main")}}./vendor/{{.ImportPath}}{{end}}' ./vendor/...)
+GO_VENDOR_PKGS := $(shell go list -f '{{if and (or .GoFiles .CgoFiles) (ne .Name "main")}}./vendor/{{.ImportPath}}{{end}}' -mod=vendor ./vendor/...)
 
 GO_TEST ?= go test
 ifneq ($(shell command -v gotest),)