test/bench/shootout: update post-Makefile

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5696054

test/bench/shootout/Makefile

-# Copyright 2011 The Go Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-
-include ../../../src/Make.inc
-
-all:
-	@echo "make clean or timing"
-
-timing:
-	./timing.sh
-
-clean:
-	rm -f [568].out *.[568]

test/bench/shootout/timing.sh

@@ -5,7 +5,11 @@
 
 set -e
 
-eval $(gomake --no-print-directory -f ../../../src/Make.inc go-env)
+eval $(go tool dist env)
+O=$GOCHAR
+GC="go tool ${O}g"
+LD="go tool ${O}l"
+
 PATH=.:$PATH
 
 havegccgo=false