chore(Makefile): simplify uname call

Author: weisdd

Toolchain.mk

@@ -121,7 +121,7 @@ ifeq (, $(shell which $(KO)))
 	$(info $(M) installing ko)
 	@{ \
 	set -e ;\
-	OSTYPE=$(shell uname | awk '{print $$0}') && ARCH=$(shell go env GOARCH) && \
+	OSTYPE=$(shell uname) && ARCH=$(shell go env GOARCH) && \
 	curl -sSLo $(KO).tar.gz https://github.com/ko-build/ko/releases/download/$(KO_VERSION)/ko_$${OSTYPE}_$${ARCH}.tar.gz && \
 	tar -zxvf $(KO).tar.gz ko && \
 	chmod +x ko && \