Enable timerfd in libusb.

third_party/libusb/libusb.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.
 
 {
   'targets': [
     {
       'target_name': 'libusb',
       'type': 'static_library',
       'sources': [
@@ skipping 46 matching lines @@
             'THREADS_POSIX=1',
           ],
         }],
         ['OS=="linux"', {
           'sources': [
             'src/libusb/os/linux_usbfs.c',
             'src/libusb/os/linux_usbfs.h',
           ],
           'defines': [
             'OS_LINUX=1',
+            'USBI_TIMERFD_AVAILABLE',
             '_GNU_SOURCE=1',
           ],
         }],
         ['use_udev==1', {
           'sources': [
             'src/libusb/os/linux_udev.cc',
           ],
           'defines': [
             'HAVE_LIBUDEV=1',
             'USE_UDEV=1',
@@ skipping 47 matching lines @@
           ],
           'include_dirs': [
             'src/msvc',
           ],
           'msvs_disabled_warnings': [ 4267 ],
         }],
       ],
     },
   ],
 }