Update location of the stable_abi.py script

[encukou]

Fixes: #1102

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📚 Documentation preview 📚: https://cpython-devguide--1103.org.readthedocs.build/

[AlexWaygood]

This one still fails on my machine with a fresh build of 3.12 FYI:

> python ./Tools/build/stable_abi.py --all ./Misc/stable_abi.toml
Running Debug|x64 interpreter...
Traceback (most recent call last):
File "C:\Users\alexw\coding\cpython\Tools\build\stable_abi.py", line 757, in <module>
main()
File "C:\Users\alexw\coding\cpython\Tools\build\stable_abi.py", line 723, in main
results['unixy_check'] = do_unixy_check(manifest, args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\alexw\coding\cpython\Tools\build\stable_abi.py", line 394, in do_unixy_check
present_macros = gcc_get_limited_api_macros(['Include/Python.h'])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\alexw\coding\cpython\Tools\build\stable_abi.py", line 526, in gcc_get_limited_api_macros
sysconfig.get_config_var("CC").split()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'split'

But at least the instructions now point to scripts that actually exist 😆

[encukou]

Whoa! I've meant to exclude that on Windows, but apparently I forgot!

(un)fortunately there currently aren't any extra checks to run on Windows, so as a workaround, instead of --all you can:

• use --generate-all
• check that git diff is empty

[encukou]

Issue: python/cpython#105091