PEP 739 / `build-details.json`: `c_api.include` is used instead of `c_api.headers`

[mgorny]

Bug report

Bug description:

PEP 739 specifies that the CPython header directory is included in the c_api.headers key. However, it seems that the implemented that landed in #130069 uses c_api.include instead:

{
 ...
 "c_api": {
 "include": "/usr/include",
 "pkgconfig_path": "/usr/lib64/pkgconfig"
 }
}

I don't see any evidence that the name was changed deliberately. In fact, the code seems to be mixing both include and headers names:

cpython/Tools/build/generate-build-details.py

Line 126 in 1a07a01

data['c_api']['include'] = INCLUDEDIR

cpython/Tools/build/generate-build-details.py

Lines 138 to 145 in 1a07a01

	PATH_KEYS = [
	'base_interpreter',
	'libpython.dynamic',
	'libpython.dynamic_stableabi',
	'libpython.static',
	'c_api.headers',
	'c_api.pkgconfig_path',
	]

CPython versions tested on:

3.14, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-134455: Fix build-details.json to use the c_api.headers key #134456
• [3.14] gh-134455: Fix build-details.json to use the c_api.headers key (GH-134456) #134504