Always generate cargo.out, even on successful build

Makefile

@@ -9,7 +9,7 @@ bench:
 	@$(CARGO) bench
 
 build:
-	@env TERM=xterm-256color $(CARGO) build --color=always 2>&1 && rm -f cargo.out || $(CARGO) build 2> cargo.out
+	@env TERM=xterm-256color $(CARGO) build --color=always 2>&1; $(CARGO) build 2> cargo.out 1>/dev/null
 
 check: build test