PyDescr_NewMethod() and PyCFunction_NewEx() now include the method
name in the SystemError "bad call flags" error message to ease debug.

* Remove unused tstate argument from init_set_builtins_open()
* Replace fd (int) with tstate (PyThreadState *) in in _Py_FatalError_PrintExc()

Received email on the docs mailing list to fix a typo from `sys.platlitdir` which doesn't exist to the correct new attribute `sys.platlibdir`

Automerge-Triggered-By: @vstinner

- When casting to _Bool, arrays should only contain zeros or ones.

AIX: Fix _aix_support module when the subprocess is not available,
when building Python from scratch. It now uses new private
_bootsubprocess module, rather than having two implementations
depending if subprocess is available or not. So
_aix_support.aix_platform() result is now the same if subprocess is
available or not.

PyInterpreterState.eval_frame function now requires a tstate (Python
thread state) parameter.

Add private functions to the C API to get and set the frame
evaluation function:

* Add tstate parameter to _PyFrameEvalFunction function type.
* Add _PyInterpreterState_GetEvalFrameFunc() and
  _PyInterpreterState_SetEvalFrameFunc() functions.
* Add tstate parameter to _PyEval_EvalFrameDefault().