Fix Clang compilation error on Android in libevent.gyp.

third_party/libevent/libevent.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': {
     'use_system_libevent%': 0,
   },
   'conditions': [
     ['use_system_libevent==0', {
@@ skipping 18 matching lines @@
             'signal.c',
             'strlcpy.c',
           ],
           'defines': [
             'HAVE_CONFIG_H',
           ],
           'conditions': [
             # libevent has platform-specific implementation files.  Since its
             # native build uses autoconf, platform-specific config.h files are
             # provided and live in platform-specific directories.
-            [ 'OS == "linux"', {
+            [ 'OS == "linux" or (OS == "android" and _toolset == "host")', {
               'sources': [ 'epoll.c', 'epoll_sub.c' ],
               'include_dirs': [ 'linux' ],
               'link_settings': {
                 'libraries': [
                   # We need rt for clock_gettime().
                   # TODO(port) Maybe on FreeBSD as well?
                   '-lrt',
                 ],
               },
             }],
-            [ 'OS == "android"', {
+            [ 'OS == "android" and _toolset == "target"', {
               # On android, epoll_create(), epoll_ctl(), epoll_wait() and
               # clock_gettime() are all in libc.so, so no need to add
               # epoll_sub.c and link librt.
               'sources': [ 'epoll.c' ],
               'include_dirs': [ 'android' ],
             }],
             [ 'OS == "mac" or OS == "ios" or os_bsd==1', {
               'sources': [ 'kqueue.c' ],
               'include_dirs': [ 'mac' ]
             }],
@@ skipping 18 matching lines @@
           'link_settings': {
             'libraries': [
               '-levent',
             ],
           },
         }
       ],
     }],
   ],
 }