Build changes to support work on the BSDs.
This does still contain some FreeBSD-specific bits, but
it's a pain to do partial diffs.
R=rsc
https://golang.org/cl/152138
diff --git a/src/make-arm.bash b/src/make-arm.bash
index d47467b..239e7c6 100755
--- a/src/make-arm.bash
+++ b/src/make-arm.bash
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
# Copyright 2009 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.
