Fix calling order of PyEval_InitThreads. (GH-5833)

As described in Doc/c-api/init.rst, PyEval_InitThreads() cannot be called before Py_Initialize() function. (cherry picked from commit 9e61066) Co-authored-by: Kenta Murata <mrkn@users.noreply.github.com>

Author: 2 people

Modules/_ctypes/callbacks.c

@@ -417,8 +417,8 @@ CThunkObject *_ctypes_alloc_callback(PyObject *callable,
 static void LoadPython(void)
 {
  if (!Py_IsInitialized()) {
- PyEval_InitThreads();
  Py_Initialize();
+ PyEval_InitThreads();
  }
 }