Issue #11750: The Windows API functions scattered in the _subprocess and
_multiprocessing.win32 modules now live in a single module "_winapi".
Patch by sbt.
diff --git a/Lib/multiprocessing/reduction.py b/Lib/multiprocessing/reduction.py
index dda4a41..c80de59 100644
--- a/Lib/multiprocessing/reduction.py
+++ b/Lib/multiprocessing/reduction.py
@@ -60,11 +60,11 @@
 #
 
 if sys.platform == 'win32':
-    from _multiprocessing import win32
+    import _winapi
 
     def send_handle(conn, handle, destination_pid):
-        process_handle = win32.OpenProcess(
-            win32.PROCESS_ALL_ACCESS, False, destination_pid
+        process_handle = _winapi.OpenProcess(
+            _winapi.PROCESS_ALL_ACCESS, False, destination_pid
             )
         try:
             new_handle = duplicate(handle, process_handle)