pkg-config-wrapper: use system_libdir for libpath

build/linux/system.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': {
     'conditions': [
       ['sysroot!=""', {
-        'pkg-config': '<(chroot_cmd) ./pkg-config-wrapper "<(sysroot)" "<(target_arch)"',
+        'pkg-config': '<(chroot_cmd) ./pkg-config-wrapper "<(sysroot)" "<(target_arch)" "<(system_libdir)"',
         # libgcrypt-config-wrapper invokes libgcrypt-config directly from the 
         # sysroot, so there's no need to prefix it with <(chroot_cmd).
         'libgcrypt-config': './libgcrypt-config-wrapper "<(sysroot)"',
       }, {
         'pkg-config': 'pkg-config',
         'libgcrypt-config': 'libgcrypt-config',
       }],
     ],
 
     'linux_link_libgps%': 0,
@@ skipping 1024 matching lines @@
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l libudev)',
             ],
           },
         }],
       ],
     },
   ],
 }