fix build - missing file

TBR=r
OCL=28575
CL=28575

src/lib/os/proc.go

+// 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.
+
+package os
+
+import (
+	"os";
+	"syscall";
+)
+
+var Args []string;	// provided by runtime
+var Envs []string;	// provided by runtime
+
+// Exit causes the current program to exit with the given status code.
+// Conventionally, code zero indicates success, non-zero an error.
+// returning exit status n.
+func Exit(code int) {
+	syscall.Syscall(syscall.SYS_EXIT, int64(code), 0, 0)
+}
+