Revert "python3-setuptools: patch entrypoints for faster initialization"

Apologies, but the patch is not possible to rebase onto the new setuptools,
as the code has changed too much. Please get it accepted upstream first.

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>