Update Makefile to support file paths with space

characters.

Author: mark-dell-usa

Makefile

@@ -160,7 +160,7 @@ manifests: controller-gen ## Generate WebhookConfiguration, ClusterRole and Cust
 .PHONY: generate
 generate: controller-gen protoc ## Generate code containing DeepCopy, DeepCopyInto, and DeepCopyObject method implementations. Also generate protoc / gRPC code
 	$(CONTROLLER_GEN) object:headerFile="hack/boilerplate.go.txt" paths="./..."
-	PATH=$(PATH):$(shell pwd)/bin/proto/bin && $(PROTOC) --go_out=. --go-grpc_out=. pkg/peerhealth/peerhealth.proto
+	PATH='$(PATH)':$(shell pwd)/bin/proto/bin && $(PROTOC) --go_out=. --go-grpc_out=. pkg/peerhealth/peerhealth.proto
 
 .PHONY: fmt
 fmt: ## Run go fmt against code.