Add zen_workaround to our repo

[rocallahan]

It previously lived at https://gist.github.com/glandium/01d54cefdb70561b5f6675e08f2990f2

Resolves #3690

@glandium can you verify that this is OK? I'm not sure what to do about licensing, authorship etc.

[glandium]

I'm not sure what to do about licensing, authorship etc.

I guess you can add a GPLv2 block at the beginning of the file, add a copyright notice (year would be 2020), and put me as the author, as the comment about inspiration (https://gist.github.com/glandium/01d54cefdb70561b5f6675e08f2990f2?permalink_comment_id=3459684#gistcomment-3459684) only applies to the earliest revisions of the gist.

[rocallahan]

@glandium let me know if this is OK.

[rocallahan]

OK, how about this?

[rocallahan]

This landed.