Hush dangerous GNU comment, mark "check" rule as phony

Makefile

@@ -62,7 +62,7 @@ lint:
 test:
 	for PKG in $(PACKAGES); do go test -cover -coverprofile $$GOPATH/src/$$PKG/coverage.out $$PKG || exit 1; done;
 
-# As for GNU Coding Standard
+.PHONY: check
 check: test
 
 .PHONY: install