Non-SFI Mode: Build libevent with PNaCl toolchain for nacl_helper_nonsfi.

third_party/libevent/libevent_nacl.gyp

+# Copyright 2014 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.
+
+{
+  'includes': [
+    '../../build/common_untrusted.gypi',
+  ],
+  'conditions': [
+    ['disable_nacl==0', {
+      'targets': [
+        {
+          'target_name': 'event_nonsfi_nacl',
+          'type': 'none',
+          'sources': [
+            'buffer.c',
+            'evbuffer.c',
+            'event.c',
+            'evutil.c',
+            'log.c',
+            'poll.c',
+            'signal.c',
+            'strlcpy.c',
+            'nacl/config.h',
+            'nacl/event-config.h',
+          ],
+          'defines': [
+            'HAVE_CONFIG_H',
+          ],
+          'variables': {
+            'include_dirs': [
+              'nacl',
+              '<(DEPTH)/native_client/src/public/linux_syscalls/',
+            ],
+            'nacl_untrusted_build': 1,
+            'nlib_target': 'libevent_nonsfi_nacl.a',
+            'build_glibc': 0,
+            'build_newlib': 0,
+            'build_irt': 0,
+            'build_pnacl_newlib': 0,
+            'build_nonsfi_helper': 1,
+          },
+          'dependencies': [
+            '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
+          ],
+        },
+      ],
+    }],
+  ],
+}