Update path to package template

Change-Id: I2487712ac010f3e97751a5a9e29355af293d6fe9
diff --git a/BUILD.gn b/BUILD.gn
index 90ec46a..3595b65 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("vim_config") {
   cflags = [