sort: remove testing cycle

import cycle:
        "testing"
        imports "flag"
        imports "sort"
        imports "testing"

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4811048
diff --git a/src/pkg/sort/search_test.go b/src/pkg/sort/search_test.go
index 0005cd2..07295ff 100644
--- a/src/pkg/sort/search_test.go
+++ b/src/pkg/sort/search_test.go
@@ -2,9 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package sort
+package sort_test
 
-import "testing"
+import (
+	. "sort"
+	"testing"
+)
 
 func f(a []int, x int) func(int) bool {
 	return func(i int) bool {