title: cx_Freeze fails to include Cython .pyx module
body: <p>I have a Python application to which I recently added a Cython module. Running it from script with pyximport works fine, but I also need an executable version which I build with cx_Freeze.</p>
  
  <p>Trouble is, trying to build it gives me an executable that raises ImportError trying to import the .pyx module.</p>
  
  <p>I modified my <code>setup.py</code> like so to see if I could get it to compile the .pyx first so that cx_Freeze could successfully pack it:</p>
  
  <pre><code>from cx_Freeze import setup, Executable
  from Cython.Build import cythonize
  
  
  setup(name='projectname',
        version='0.0',
        description=' ',
        options={"build_exe": {"packages":["pygame","fx"]},'build_ext': {'compiler': 'mingw32'}},
        ext_modules=cythonize("fx.pyx"),
        executables=[Executable('main.py',targetName="myproject.exe",base = "Win32GUI")],
        requires=['pygcurse','pyperclip','rsa','dill','numpy']
        )
  </code></pre>
  
  <p>... but then all that gives me is <code>No module named fx</code> within cx_Freeze at build-time instead.</p>
  
  <p>How do I make this work?</p>