🐳 Move linux pkg_config() calls into separate BUILD.gn files

dbus/BUILD.gn

 # 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.
 
 import("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 component("dbus") {
   sources = [
     "bus.cc",
@@ skipping 27 matching lines @@
 
   defines = [ "DBUS_IMPLEMENTATION" ]
 
   deps = [
     "//third_party/protobuf:protobuf_lite",
   ]
   public_deps = [
     "//base",
   ]
 
-  public_configs = [ "//build/config/linux:dbus" ]
+  public_configs = [ "//build/config/linux/dbus" ]
 }
 
 proto_library("test_proto") {
   sources = [
     "test_proto.proto",
   ]
 }
 
 # This target contains mocks that can be used to write unit tests without
 # issuing actual D-Bus calls.
@@ skipping 10 matching lines @@
     "mock_object_proxy.h",
   ]
 
   public_deps = [
     ":dbus",
   ]
   deps = [
     "//testing/gmock",
   ]
 
-  configs += [ "//build/config/linux:dbus" ]
+  configs += [ "//build/config/linux/dbus" ]
 }
 
 test("dbus_unittests") {
   sources = [
     "bus_unittest.cc",
     "dbus_statistics_unittest.cc",
     "end_to_end_async_unittest.cc",
     "end_to_end_sync_unittest.cc",
     "message_unittest.cc",
     "mock_unittest.cc",
@@ skipping 12 matching lines @@
     ":dbus",
     ":test_proto",
     ":test_support",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/protobuf:protobuf_lite",
   ]
 
-  configs += [ "//build/config/linux:dbus" ]
+  configs += [ "//build/config/linux/dbus" ]
 }
 
 executable("dbus_test_server") {
   testonly = true
   sources = [
     "test_server.cc",
     "test_service.cc",
     "test_service.h",
   ]
 
   deps = [
     ":dbus",
     "//base",
     "//base/test:test_support",
     "//build/config/sanitizers:deps",
   ]
 
-  configs += [ "//build/config/linux:dbus" ]
+  configs += [ "//build/config/linux/dbus" ]
 }