GN: Change rtc_source_set targets --> rtc_static_library

webrtc/audio/BUILD.gn

 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 
-rtc_source_set("audio") {
+rtc_static_library("audio") {
   sources = [
     "audio_receive_stream.cc",
     "audio_receive_stream.h",
     "audio_send_stream.cc",
     "audio_send_stream.h",
     "audio_state.cc",
     "audio_state.h",
     "conversion.h",
     "scoped_voe_interface.h",
   ]
@@ skipping 24 matching lines @@
       "//testing/gmock",
       "//testing/gtest",
     ]
     if (is_clang) {
       # Suppress warnings from the Chromium Clang plugin.
       # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }