Revert "bpo-30860: Consolidate stateful runtime globals." (#3379)

Windows buildbots started failing due to include-related errors.
diff --git a/Modules/_winapi.c b/Modules/_winapi.c
index 6556d99..682d0a3 100644
--- a/Modules/_winapi.c
+++ b/Modules/_winapi.c
@@ -114,7 +114,7 @@
         {
             /* The operation is no longer pending -- nothing to do. */
         }
-        else if _Py_IS_FINALIZING()
+        else if (_Py_Finalizing == NULL)
         {
             /* The operation is still pending -- give a warning.  This
                will probably only happen on Windows XP. */