[BUG] longintrepr.h not found

[ericsnowcurrently]

Describe the bug

An extension using Cython with CPython main won't build:

gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -O0 -fPIC -I/home/esnow/projects/work/cpython-perf/uvloop/uvloop-dev-3.11/include -I/home/esnow/projects/work/cpython-perf/cpython/Include -I/home/esnow/projects/work/cpython-perf/cpython -c aiohttp/_websocket.c -o build/temp.linux-x86_64-3.11/aiohttp/_websocket.o
  aiohttp/_websocket.c:198:12: fatal error: longintrepr.h: No such file or directory
     #include "longintrepr.h"
              ^~~~~~~~~~~~~~~

To Reproduce

Try to build https://github.com/MagicStack/uvloop.

Environment (please complete the following information):

• OS: Linux
• Python version 3.11.0 (pre-alpha)
• Cython version 0.29.24

Additional context

About a month ago, Include/longintrepr.h was moved to Include/cpython/longintrepr.h. See python/cpython#28968 (https://bugs.python.org/issue35134).

[ericsnowcurrently]

Looks like this was already fixed in #4428.