Fix #9600. Don't use relative imports for _multiprocessing on Windows.
Same fix as #9513 on 3.x.
diff --git a/Misc/NEWS b/Misc/NEWS
index 1ffcb49..cc0ac5c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Library
 -------
 
+- Issue #9600: Don't use relative import for _multiprocessing on Windows.
+
 - Issue #8688: Revert regression introduced in 2.6.6rc1 (making Distutils
   recalculate MANIFEST every time).