bpo-45574: fix warning about `print_escape` being unused (GH-29172) (#29176)

It used to be like this:
<img width="1232" alt="Снимок экрана 2021-10-22 в 23 07 40" src="https://user-images.githubusercontent.com/4660275/138516608-fef6ec01-a96a-40f4-81ef-52265b0f536b.png">

Quick `grep` tells that it is just used in one place under `Py_DEBUG`: https://github.com/python/cpython/blame/f6e8b80d20159596cf641305bad3a833bedd2f4f/Parser/tokenizer.cGH-L1047-L1051
<img width="752" alt="Снимок экрана 2021-10-22 в 23 08 09" src="https://user-images.githubusercontent.com/4660275/138516684-ea503136-1e92-48a5-95bb-419e190d5866.png">

I am not sure, but it also looks like a private thing, it should not affect other users.

Automerge-Triggered-By: GH:pablogsal
(cherry picked from commit 4bc5473a42c5eae0928430930b897209492e849d)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>