Makefile: fix to work 'make help' when using Makefile.local

Makefile

@@ -62,17 +62,17 @@ all: crystal ## Build all files (currently crystal only) [default]
 help: ## Show this help
 	@echo
 	@printf '\033[34mtargets:\033[0m\n'
-	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) |\
+	@grep -hE '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) |\
 		sort |\
 		awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2}'
 	@echo
 	@printf '\033[34moptional variables:\033[0m\n'
-	@grep -E '^[a-zA-Z_-]+ \?=.*?## .*$$' $(MAKEFILE_LIST) |\
+	@grep -hE '^[a-zA-Z_-]+ \?=.*?## .*$$' $(MAKEFILE_LIST) |\
 		sort |\
 		awk 'BEGIN {FS = " \\?=.*?## "}; {printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2}'
 	@echo
 	@printf '\033[34mrecipes:\033[0m\n'
-	@grep -E '^##.*$$' $(MAKEFILE_LIST) |\
+	@grep -hE '^##.*$$' $(MAKEFILE_LIST) |\
 		awk 'BEGIN {FS = "## "}; /^## [a-zA-Z_-]/ {printf "  \033[36m%s\033[0m\n", $$2}; /^##  / {printf "  %s\n", $$2}'
 
 .PHONY: spec