pkg-config-wrapper: use system_libdir for libpath

net/third_party/nss/ssl.gyp

 # Copyright (c) 2012 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.
 
 {
   'conditions': [
     [ 'os_posix == 1 and OS != "mac" and OS != "ios"', {
       'conditions': [
         ['sysroot!=""', {
           'variables': {
-            'pkg-config': '../../../build/linux/pkg-config-wrapper "<(sysroot)" "<(target_arch)"',
+            'pkg-config': '../../../build/linux/pkg-config-wrapper "<(sysroot)" "<(target_arch)" "<(system_libdir)"',
           },
         }, {
           'variables': {
             'pkg-config': 'pkg-config'
           },
         }],
       ],
     }],
   ],
 
@@ skipping 168 matching lines @@
       'configurations': {
         'Debug_Base': {
           'defines': [
             'DEBUG',
           ],
         },
       },
     },
   ],
 }