Fix android depfiles to always list GN's outputs[0]

build/config/zip.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Creates a zip archive of the inputs.
 #
 # inputs (required)
 #     List of input files relative to the current directory.
 #
 # output (required)
 #     File name to write.
 #
 # base_dir (optional)
 #     If provided, the archive paths will be relative to this directory.
 #
 # deps, public_deps, data_deps, testonly, visibility (optional)
 #     Normal meaning.
 template("zip") {
   action(target_name) {
     script = "//build/android/gn/zip.py"
     depfile = "$target_gen_dir/$target_name.d"
     inputs = invoker.inputs
     outputs = [
-      depfile,
       invoker.output,
     ]
 
     assert(defined(invoker.inputs))
     rebase_inputs = rebase_path(invoker.inputs, root_build_dir)
 
     assert(defined(invoker.output))
     rebase_output = rebase_path(invoker.output, root_build_dir)
 
     args = [
@@ skipping 12 matching lines @@
     forward_variables_from(invoker,
                            [
                              "testonly",
                              "deps",
                              "public_deps",
                              "data_deps",
                              "visibility",
                            ])
   }
 }