Update path to package template

Change-Id: Id9c000a8de68f5aaa08502200d6e698d9ec57305
diff --git a/BUILD.gn b/BUILD.gn
index c6bd0d5..b2f2dc1 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")
 
 config("re2_config") {
   include_dirs = [ "." ]