[issue23746] sysconfg.is_python_build() is buggy

[STINNER Victor]

STINNER Victor added the comment:

> On second thoughts, why have such a function if it works correctly only when executed from source Cpython folder using source CPython executable  and not otherwise ?

It's useful to know such information. Python behaves a little bit
differently when run from the source code (not installed).

Example of usage of this function:

Lib/test/test_asdl_parser.py:12:if not sysconfig.is_python_build():
Lib/test/test_gdb.py:38:if not sysconfig.is_python_build():
Lib/test/test_pyexpat.py:448:            if sysconfig.is_python_build():
Lib/test/test_subprocess.py:415:
@unittest.skipIf(sysconfig.is_python_build(),

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23746>
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