title: Is it possible to exclude certain files when building a wheel with setup.py?
body: <p>I know you can exclude certain packages using:</p>
  
  <pre><code>packages = find_packages("src", exclude=["test"]),
  </code></pre>
  
  <p>Is it also possible to exclude single python files?
  I am building a binary wheel and want to exclude certain source files which I "cythonized" with a custom function:</p>
  
  <pre><code>python cythonize bdist_wheel
  </code></pre>
  
  <p>At the moment I remove all python files which also have a .so library file after building the wheel with a custom script and I would like to do that with setup.py.</p>