#311 GetOverlappedResult doesn't release GIL

[Sturla]

More of the same bug, although this one doesn't deadlock:

GetOverlappedResult (win32file.i) doesn't release the GIL.

If wait is set to 1, GetOverlappedResult will block and hold the GIL until the asynchronous IO completes.

[Mark Hammond]

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Ditto - check the generated .cpp

static PyObject *_wrap_GetOverlappedResult(PyObject *self, PyObject *args) {
...
Py_BEGIN_ALLOW_THREADS
_result = (BOOLAPI )GetOverlappedResult(_arg0,_arg1,_arg2,_arg3);

Py_END_ALLOW_THREADS