bpo-38631: _PyGILState_Init() returns PyStatus (GH-18908)

_PyGILState_Init() now returns PyStatus rather than calling
Py_FatalError() on failure.
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index d00bf82..bc32eff 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -551,7 +551,10 @@
     _PyEval_FiniThreads(&runtime->ceval);
 
     /* Auto-thread-state API */
-    _PyGILState_Init(tstate);
+    status = _PyGILState_Init(tstate);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
+    }
 
     /* Create the GIL */
     status = _PyEval_InitThreads(tstate);