Do not remove gobuild during clean

Author: ajanikow

Makefile

@@ -111,7 +111,7 @@ endif
 all: build
 
 clean:
-	rm -Rf $(BIN) $(BINDIR) $(GOBUILDDIR) $(ROOTDIR)/arangodb
+	rm -Rf $(BIN) $(BINDIR) $(ROOTDIR)/arangodb
 
 local:
 ifneq ("$(DOCKERCLI)", "")
@@ -212,6 +212,9 @@ run-tests-docker: docker _run-tests
 run-tests-local: export TEST_MODES=localprocess
 run-tests-local: _run-tests
 
+$(GOBUILDDIR):
+	@mkdir -p "$(GOBUILDDIR)"
+
 ## LINT
 
 GOLANGCI_ENABLED=deadcode gocyclo golint varcheck structcheck maligned errcheck \