third_party: Use libdrm third_party libdrm by default.

third_party/libdrm/BUILD.gn

 # Copyright 2016 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")
 
 assert(is_linux)
 
 declare_args() {
   # Controls whether the build should use the version of libdrm
   # library shipped with the system. In release builds of Chrome OS we
   # use the system version, but when building on dev workstations we
   # bundle it because Ubuntu doesn't ship a usable version.
-  use_system_libdrm = true
+  use_system_libdrm = false
 }
 
 if (!use_system_libdrm) {
   config("libdrm_config") {
     include_dirs = [
       "src",
       "src/include",
       "src/include/drm",
     ]
     if (is_clang) {
@@ skipping 21 matching lines @@
 }
 
 if (use_system_libdrm) {
   pkg_config("libdrm_config") {
     packages = [ "libdrm" ]
   }
   group("libdrm") {
     public_configs = [ ":libdrm_config" ]
   }
 }