Update path to package template

Change-Id: I073cac261e6659c12297aa4e4003e18cc92bd3b1
diff --git a/BUILD.gn b/BUILD.gn
index c02d3e7..0818005 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//packages/package.gni")
+import("//build/package.gni")
 
 package("leveldb_tests") {
   testonly = true