Move pthread flags out compiler config.

build/config/linux/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("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 
 group("linux") {
   visibility = [ "//:optimize_gn_gen" ]
 }
 
 # This is included by reference in the //build/config/compiler config that
 # is applied to all targets. It is here to separate out the logic that is
 # Linux-only. This is not applied to Android, but is applied to ChromeOS.
 config("compiler") {
-  cflags = [ "-pthread" ]
-  ldflags = [ "-pthread" ]
 }
 
 # This is included by reference in the //build/config/compiler:runtime_library
 # config that is applied to all targets. It is here to separate out the logic
 # that is Linux-only. Please see that target for advice on what should go in
 # :runtime_library vs. :compiler.
 config("runtime_library") {
   # Set here because OS_CHROMEOS cannot be autodetected in build_config.h like
   # OS_LINUX and the like.
   if (is_chromeos) {
@@ skipping 61 matching lines @@
 if (use_glib) {
   pkg_config("glib") {
     packages = [
       "glib-2.0",
       "gmodule-2.0",
       "gobject-2.0",
       "gthread-2.0",
     ]
   }
 }