Py_FatalError(): don't sys sys.last_xxx variables

Call PyErr_PrintEx(0) instead of PyErr_Print() to avoid a crash if
Py_FatalError() is called in an early stage of Python initialization (if PySys
is not yet initialized).
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 1581c90..05a9800 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -2055,7 +2055,7 @@
     fprintf(stderr, "Fatal Python error: %s\n", msg);
     fflush(stderr); /* it helps in Windows debug build */
     if (PyErr_Occurred()) {
-        PyErr_Print();
+        PyErr_PrintEx(0);
     }
 #ifdef MS_WINDOWS
     {