GN: Use lib.unstripped rather than lib.stripped. Add a toolchain.gni

third_party/cython/rules.gni

 # 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.
 
+import("//build/toolchain/toolchain.gni")
+
 template("python_binary_source_set") {
   # Only available on linux for now.
   assert(is_linux)
   assert(defined(invoker.cython_sources) || defined(invoker.sources))
 
   config_name = target_name + "_python_config"
 
   target_visibility = [ ":$target_name" ]
 
   if (defined(invoker.cython_sources)) {
@@ skipping 127 matching lines @@
 
   copy(target_name) {
     if (defined(invoker.python_base_module)) {
       python_base_module = invoker.python_base_module
       output = "$root_out_dir/python/$python_base_module/${target_name}${python_module_suffix}"
     } else {
       output = "$root_out_dir/python/${target_name}${python_module_suffix}"
     }
 
     sources = [
-      "$root_out_dir/${shared_library_prefix}${shared_library_name}${shared_library_suffix}",
+      "$root_shlib_dir/${shared_library_prefix}${shared_library_name}${shared_library_suffix}",
     ]
     outputs = [
       output,
     ]
     deps = [
       ":$shared_library_name",
     ]
   }
 }