net: fix build on android

Change-Id: Ib6d0b2947748dec98cad2e6abb6812cac46a9897
Reviewed-on: https://go-review.googlesource.com/11220Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/cgo_resnew.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build cgo,!netgo
-// +build darwin linux netbsd solaris
+// +build darwin linux,!android netbsd solaris
 
 package net
 

src/net/cgo_resold.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build cgo,!netgo
-// +build freebsd dragonfly openbsd
+// +build android freebsd dragonfly openbsd
 
 package net