runtime: remove empty 386 archauxv

archauxv no longer does anything on 386, so remove it.

Change-Id: I94545238e40fa6a6832a7c3b40aedfc6c1f6a97b
Reviewed-on: https://go-review.googlesource.com/22063Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/os_linux_386.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 runtime
-
-const (
-	_AT_SYSINFO = 32
-)
-
-func archauxv(tag, val uintptr) {
-}

src/runtime/os_linux_noauxv.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !386,!amd64,!arm,!arm64
+// +build !amd64,!arm,!arm64
 
 package runtime