[PR #10366/3fb2c8df backport][3.11] Fix sdist make

[patchback]

This is a backport of PR #10366 as merged into master (3fb2c8d).

What do these changes do?

Three fixes related to use of source distribution to build aiohttp:

1. Add missing tools directory to sdist, as it is required by the Makefile targets.
2. Fix tools/gen.py to work outside a git checkout, by looking for pyproject.toml rather than .git.
3. Add a cythonize-nodeps target that can be used by downstream packagers to perform cythonization without calling pip.

Are there changes in behavior for the user?

This fixes the ability to call make when working in an unpacked source distribution (currently it would fail due to missing tools/gen.py).

Is it a substantial burden for the maintainers to support this?

Don't think so. Worst case, the extra Makefile rule would go out of sync.

Related issue number

n/a

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
• Add a new news fragment into the CHANGES/ folder

[codspeed-hq]

CodSpeed Performance Report

Merging #10367 will improve performances by 10.68%

_{Comparing patchback/backports/3.11/3fb2c8dfcc8f52089cb48a1136d3e569d1ac73ff/pr-10366 (e481a57) with 3.11 (ac895b8)}

Summary

⚡ 1 improvements
✅ 46 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_one_hundred_get_requests_with_512kib_chunked_payload[pyloop]	233.9 ms	211.3 ms	+10.68%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.06%. Comparing base (ac895b8) to head (e481a57).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11   #10367      +/-   ##
==========================================
- Coverage   98.07%   98.06%   -0.01%     
==========================================
  Files         123      123              
  Lines       37228    37228              
  Branches     4477     4477              
==========================================
- Hits        36510    36507       -3     
- Misses        540      543       +3     
  Partials      178      178              

Flag	Coverage Δ
CI-GHA	97.95% <ø> (-0.01%)	⬇️
OS-Linux	97.65% <ø> (-0.01%)	⬇️
OS-Windows	94.69% <ø> (ø)
OS-macOS	96.78% <ø> (-0.01%)	⬇️
Py-3.10.11	96.63% <ø> (ø)
Py-3.10.16	97.20% <ø> (-0.01%)	⬇️
Py-3.11.11	97.28% <ø> (+0.03%)	⬆️
Py-3.11.9	96.72% <ø> (+0.01%)	⬆️
Py-3.12.8	97.72% <ø> (+0.03%)	⬆️
Py-3.13.1	97.71% <ø> (ø)
Py-3.9.13	96.56% <ø> (ø)
Py-3.9.21	97.12% <ø> (ø)
Py-pypy7.3.16	96.70% <ø> (+<0.01%)	⬆️
VM-macos	96.78% <ø> (-0.01%)	⬇️
VM-ubuntu	97.65% <ø> (-0.01%)	⬇️
VM-windows	94.69% <ø> (ø)

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