* python/python-internal.h (PyGILState_Ensure): New define.

	* python/python-internal.h (PyGILState_Ensure): New define.
	(PyGILState_Release): Likewise.
	(PyEval_InitThreads): Likewise.
	(PyThreadState_Swap): Likewise.
	(PyEval_InitThreads): Likewise.
	* python/python.c (_initialize_python): Initialize threads.
	Release GIL.
	(eval_python_from_control_command): Acquire GIL.
	(python_command): Likewise.
	* python/python-internal.h (make_cleanup_py_restore_gil):
	Declare.
	* python/python-utils.c (py_gil_restore): New function.
	(make_cleanup_py_restore_gil): Likewise.