🌱 GN: Look at all target outputs when detecting duplicates

tools/gn/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//testing/test.gni")
 
 defines = [ "GN_BUILD" ]
 
 static_library("gn_lib") {
   configs += [ "//build/config:precompiled_headers" ]
@@ skipping 267 matching lines @@
     "functions_target_unittest.cc",
     "functions_unittest.cc",
     "header_checker_unittest.cc",
     "inherited_libraries_unittest.cc",
     "input_conversion_unittest.cc",
     "label_pattern_unittest.cc",
     "label_unittest.cc",
     "loader_unittest.cc",
     "ninja_action_target_writer_unittest.cc",
     "ninja_binary_target_writer_unittest.cc",
+    "ninja_build_writer_unittest.cc",
     "ninja_copy_target_writer_unittest.cc",
     "ninja_create_bundle_target_writer_unittest.cc",
     "ninja_group_target_writer_unittest.cc",
     "ninja_target_writer_unittest.cc",
     "ninja_toolchain_writer_unittest.cc",
     "operators_unittest.cc",
     "parse_tree_unittest.cc",
     "parser_unittest.cc",
     "path_output_unittest.cc",
     "pattern_unittest.cc",
@@ skipping 22 matching lines @@
     "format_test_data/",
   ]
 
   deps = [
     ":gn_lib",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }