GN: Fix windows clang errors. Attempt 2.

webrtc/modules/audio_coding/BUILD.gn

 # Copyright (c) 2014 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")
 import("audio_coding.gni")
@@ skipping 1519 matching lines @@
     ]
 
     if (is_win) {
       cflags = [
         # Disable warnings to enable Win64 build, issue 1323.
         "/wd4267",  # size_t to int truncation
       ]
     }
   }
 
+  config("isac_test_warnings_config") {
+    if (is_win && is_clang) {
+      cflags = [
+        # Disable warnings failing when compiling with Clang on Windows.
+        # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
+        "-Wno-format",
+      ]
+    }
+  }
+
   executable("isac_test") {
     testonly = true
 
     sources = [
       "codecs/isac/main/test/simpleKenny.c",
       "codecs/isac/main/util/utility.c",
     ]
 
     include_dirs = [
       "codecs/isac/main/include",
       "codecs/isac/main/test",
       "codecs/isac/main/util",
     ]
 
     deps = [
       ":isac",
       "../../base:rtc_base_approved",
       "//build/config/sanitizers:deps",
     ]
 
-    if (is_win && is_clang) {
-      cflags = [
-        # Disable warnings failing when compiling with Clang on Windows.
-        # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
-        "-Wno-format",
-      ]
-    }
+    configs += [ ":isac_test_warnings_config" ]
   }
 
   executable("g711_test") {
     testonly = true
 
     sources = [
       "codecs/g711/test/testG711.cc",
     ]
 
     configs += [ "../..:common_config" ]
@@ skipping 39 matching lines @@
       "//testing/gtest",
     ]
 
     if (is_clang) {
       # Suppress warnings from Chrome's Clang plugins.
       # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
       configs -= [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }