title: package data is not included in the package
body: <p>I have a project with a following structure. The executable is a package data file that I am trying to add to my package.</p>
  
  <pre><code>packagename
  ├── packagename.py
  ├── __init__.py
  └── resources
      └── executable
  </code></pre>
  
  <p>In my setup file I added the executable to the package as follows.</p>
  
  <pre><code>package_dir={'packagename': 'packagename'}, 
  package_data={'packagename': ['resources/executable',]},
  </code></pre>
  
  <p>I built the package locally with pip. I expected to find the executable in package.egg.info/SOURCES.txt but there is none.</p>
  
  <p>Is there anything that I am doing wrong that prevents the package from being added to the package, or I am checking in the wrong place? I followed this <a href="https://docs.python.org/3/distutils/setupscript.html#installing-package-data" rel="nofollow noreferrer">guidelines</a>.</p>