net: treat android like linux in tests

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/112810043
diff --git a/src/pkg/net/unix_test.go b/src/pkg/net/unix_test.go
index 05643dd..1cdff39 100644
--- a/src/pkg/net/unix_test.go
+++ b/src/pkg/net/unix_test.go
@@ -256,8 +256,11 @@
 			t.Fatalf("UnixConn.Write failed: %v", err)
 		}
 
-		if runtime.GOOS == "linux" && laddr == "" {
-			laddr = "@" // autobind feature
+		switch runtime.GOOS {
+		case "android", "linux":
+			if laddr == "" {
+				laddr = "@" // autobind feature
+			}
 		}
 		var connAddrs = [3]struct{ got, want Addr }{
 			{ln.Addr(), ta},
@@ -308,9 +311,13 @@
 			}
 		}()
 
-		if runtime.GOOS == "linux" && laddr == "" {
-			laddr = "@" // autobind feature
+		switch runtime.GOOS {
+		case "android", "linux":
+			if laddr == "" {
+				laddr = "@" // autobind feature
+			}
 		}
+
 		var connAddrs = [4]struct{ got, want Addr }{
 			{c1.LocalAddr(), ta},
 			{c1.RemoteAddr(), nil},