sysconfig provide wrong path in built cpython on windows #160905

Bug report

I'm sure that in _init_non_posix this will be wrong when in python build:

https://github.com/python/cpython/blob/main/Lib/sysconfig/__init__.py#L412

In python build, this value is just the folder where the sys.executable in. Change it to:

    if not _PYTHON_BUILD:
        vars['LIBDIR'] = _safe_realpath(os.path.join(get_config_var('installed_base'), 'libs'))
    else:
        vars['LIBDIR'] = os.path.dirname(
            _safe_realpath(sys.executable)
        )

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Linked PRs

• gh-160905: fix wrong LIBDIR config on windows #160906