net: no AI_ALL on android

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/112800043

src/pkg/net/cgo_android.go

+// Copyright 2014 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.
+
+// +build cgo,!netgo
+
+package net
+
+//#include <netdb.h>
+import "C"
+
+func cgoAddrInfoFlags() C.int {
+	return C.AI_CANONNAME
+}

src/pkg/net/cgo_linux.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 cgo,!netgo
+// +build !android,cgo,!netgo
 
 package net