title: keyring module is not included while packaging with py2exe
body: <p>I am making an app using <strong>python 2.7 on windows  and keyring-3.2.1</strong> . In my python code on eclipse, I used </p>
  
  <pre><code>import keyring
  keyring.set_password("service","jsonkey",json_res)
  json_res= keyring.get_password("service","jsonkey")
  </code></pre>
  
  <p>is working fine as I am storing json response in keyring. But, when I converted python code into exe by using py2exe, it shows import error keyring while making dist. Please suggest how to include keyring  in py2exe. </p>
  
  <pre><code>Traceback (most recent call last):
    File "APP.py", line 8, in &lt;module&gt;
    File "keyring\__init__.pyc", line 12, in &lt;module&gt;
    File "keyring\core.pyc", line 15, in &lt;module&gt;
    File "keyring\util\platform_.pyc", line 4, in &lt;module&gt;
    File "keyring\util\platform.pyc", line 29, in &lt;module&gt;
  AttributeError: 'module' object has no attribute 'system'
  </code></pre>
  
  <p><strong>platform_.py code is :</strong></p>
  
  <pre><code>from __future__ import absolute_import
  
  import os
  import platform
  
  def _data_root_Windows():
      try:
          root = os.environ['LOCALAPPDATA']
      except KeyError:
          # Windows XP
          root = os.path.join(os.environ['USERPROFILE'], 'Local Settings')
      return os.path.join(root, 'Python Keyring')
  
  def _data_root_Linux():
      """
      Use freedesktop.org Base Dir Specfication to determine storage
      location.
      """
      fallback = os.path.expanduser('~/.local/share')
      root = os.environ.get('XDG_DATA_HOME', None) or fallback
      return os.path.join(root, 'python_keyring')
  
  # by default, use Unix convention
  data_root = globals().get('_data_root_' + platform.system(), _data_root_Linux)
  </code></pre>
  
  <p><strong>platform.py code is:</strong> </p>
  
  <pre><code>import os
  import sys
  
  # While we support Python 2.4, use a convoluted technique to import
  #  platform from the stdlib.
  # With Python 2.5 or later, just do "from __future__ import absolute_import"
  #  and "import platform"
  exec('__import__("platform", globals=dict())')
  platform = sys.modules['platform']
  
  def _data_root_Windows():
      try:
          root = os.environ['LOCALAPPDATA']
      except KeyError:
          # Windows XP
          root = os.path.join(os.environ['USERPROFILE'], 'Local Settings')
      return os.path.join(root, 'Python Keyring')
  
  def _data_root_Linux():
      """
      Use freedesktop.org Base Dir Specfication to determine storage
      location.
      """
      fallback = os.path.expanduser('~/.local/share')
      root = os.environ.get('XDG_DATA_HOME', None) or fallback
      return os.path.join(root, 'python_keyring')
  
  # by default, use Unix convention
  data_root = globals().get('_data_root_' + platform.system(), _data_root_Linux)
  </code></pre>