gh-131372: Include LDVERSION and EXE in base_interpreter value (#142256)

* Include LDVERSION and EXE in base_interpreter value

In Fedora, build-details.json created and installed for python3.14t
contains "/usr/bin/python3.14" as the base_interpreter value.
Create a correct string, taking into account both LDVERSION and EXE
config variables, similarly to how it's defined in altbininstall in Makefile.

* Add news

Signed-off-by: Filipe Laíns <[email protected]>

---------

Signed-off-by: Filipe Laíns <[email protected]>
Co-authored-by: Filipe Laíns <[email protected]>

Author: befeleme

Misc/NEWS.d/next/Build/2025-12-09-14-23-51.gh-issue-131372.2TAEyz.rst

@@ -0,0 +1,2 @@
+Add ``LDVERSION`` and ``EXE`` to the ``base_interpreter`` value of
+``build-details.json``.

Tools/build/generate-build-details.py

@@ -48,7 +48,9 @@ def generate_data(schema_version: str) -> collections.defaultdict[str, Any]:
     #data['base_interpreter'] = sys._base_executable
     data['base_interpreter'] = os.path.join(
         sysconfig.get_path('scripts'),
-        'python' + sysconfig.get_config_var('VERSION'),
+        "python"
+        + sysconfig.get_config_var('LDVERSION')
+        + sysconfig.get_config_var('EXE'),
     )
     data['platform'] = sysconfig.get_platform()