Fix tautological comparison and add clang flag

third_party/openh264/BUILD.gn

 # Copyright 2015 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("//third_party/openh264/openh264_args.gni")
 
 # Config shared by all openh264 targets.
 config("config") {
   cflags = []
   defines = []
@@ skipping 244 matching lines @@
     "src/codec/encoder/core/inc",
     "src/codec/encoder/core/src",
     "src/codec/encoder/plus/inc",
     "src/codec/encoder/plus/src",
     "src/codec/processing/interface",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [ ":config" ]
+
+  # TODO: Remove after fixing always-true condition
+  # third_party/openh264/src/codec/encoder/core/src/encoder_ext.cpp:142.
+  if (is_clang) {
+    configs -= [ "//build/config/clang:extra_warnings" ]
+  }
   deps = [
     ":common",
     ":processing",
   ]
 }