Temporary workaround to trigger a rebuild of libicudata_nacl on icu version update

icu_nacl.gyp

 # Copyright 2013 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': [
     'icu.gypi',
     '../../native_client/build/untrusted.gypi',
   ],
   'target_defaults': {
@@ skipping 31 matching lines @@
       'target_name': 'icudata_nacl',
       'type': 'none',
       'variables': {
         'nlib_target': 'libicudata_nacl.a',
         'build_glibc': 0,
         'build_newlib': 0,
         'build_pnacl_newlib': 1,
       },
       'sources': [
         'source/stubdata/stubdata.c',
+        # Temporary work around for an incremental build NOT rebuilding 
+        # icudata_nacl after an ICU version change.
+        # TODO(jungshik): Remove it once a fix for bug 384752 is in.
+        'source/common/unicode/uvernum.h',
       ],
       'dependencies': [
         '../../native_client/tools.gyp:prep_toolchain',
       ],
     },
     {
       'target_name': 'icui18n_nacl',
       'type': 'none',
       'variables': {
         'nlib_target': 'libicui18n_nacl.a',
@@ skipping 40 matching lines @@
         'include_dirs': [
           'source/common',
         ],
         'defines': [
           'U_STATIC_IMPLEMENTATION',
         ],
       },
     },
   ],
 }