Apply gn format with 'sources' sorting to src/

third_party/fontconfig/BUILD.gn

 # Copyright 2014 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.
 
 assert(is_linux)
 
 config("fontconfig_config") {
   include_dirs = [ "src" ]
 }
 
@@ skipping 18 matching lines @@
     "src/src/fclist.c",
     "src/src/fcmatch.c",
     "src/src/fcmatrix.c",
     "src/src/fcname.c",
     "src/src/fcobjs.c",
     "src/src/fcpat.c",
     "src/src/fcserialize.c",
     "src/src/fcstat.c",
     "src/src/fcstr.c",
     "src/src/fcxml.c",
+    "src/src/ftglue.c",
     "src/src/ftglue.h",
-    "src/src/ftglue.c",
   ]
 
   include_dirs = [
     "include",
     "include/src",
   ]
 
   defines = [
     "HAVE_CONFIG_H",
     "FC_CACHEDIR=\"/var/cache/fontconfig\"",
@@ skipping 11 matching lines @@
     "//build/config/linux:freetype2",
   ]
 
   public_configs = [ ":fontconfig_config" ]
 
   if (is_clang) {
     # Work around a null-conversion warning. See crbug.com/358852.
     cflags = [ "-Wno-non-literal-null-conversion" ]
   }
 }