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

Windows buildbots started failing due to include-related errors.
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index ea05b6f..268dec4 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -205,9 +205,8 @@
         return PYTHREAD_INVALID_THREAD_ID;
 #endif
 #if defined(THREAD_STACK_SIZE)
-    PyThreadState *tstate = PyThreadState_GET();
-    size_t stacksize = tstate ? tstate->interp->pythread_stacksize : 0;
-    tss = (stacksize != 0) ? stacksize : THREAD_STACK_SIZE;
+    tss = (_pythread_stacksize != 0) ? _pythread_stacksize
+                                     : THREAD_STACK_SIZE;
     if (tss != 0) {
         if (pthread_attr_setstacksize(&attrs, tss) != 0) {
             pthread_attr_destroy(&attrs);
@@ -579,7 +578,7 @@
 
     /* set to default */
     if (size == 0) {
-        PyThreadState_GET()->interp->pythread_stacksize = 0;
+        _pythread_stacksize = 0;
         return 0;
     }
 
@@ -596,7 +595,7 @@
             rc = pthread_attr_setstacksize(&attrs, size);
             pthread_attr_destroy(&attrs);
             if (rc == 0) {
-                PyThreadState_GET()->interp->pythread_stacksize = size;
+                _pythread_stacksize = size;
                 return 0;
             }
         }