pkg-config-wrapper: use system_libdir for libpath

tools/emacs/testdata/media.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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the PulseAudio library.
     'use_pulseaudio%': 0,
     # Override to dynamically link the cras (ChromeOS audio) library.
@@ skipping 357 matching lines @@
         ['OS!="openbsd"', {
           'sources!': [
             'audio/openbsd/audio_manager_openbsd.cc',
             'audio/openbsd/audio_manager_openbsd.h',
           ],
         }],
         ['OS=="linux"', {
           'variables': {
             'conditions': [
               ['sysroot!=""', {
-                'pkg-config': '../build/linux/pkg-config-wrapper "<(sysroot)" "<(target_arch)"',
+                'pkg-config': '../build/linux/pkg-config-wrapper "<(sysroot)" "<(target_arch)" "<(system_libdir)"',
               }, {
                 'pkg-config': 'pkg-config'
               }],
             ],
           },
           'conditions': [
             ['use_cras == 1', {
               'cflags': [
                 '<!@(<(pkg-config) --cflags libcras)',
               ],
@@ skipping 707 matching lines @@
             '../third_party/ffmpeg/ffmpeg.gyp:ffmpeg',
           ],
           'sources': [
             'tools/media_bench/media_bench.cc',
           ],
         },
       ],
     }]
   ],
 }