fix ntpath.join on UNC-style paths by backporting py3k's splitdrive (closes #21672)
diff --git a/Misc/NEWS b/Misc/NEWS
index 664eba7..aa05403 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -29,6 +29,8 @@
 Library
 -------
 
+- Issue #21672: Fix the behavior of ntpath.join on UNC-style paths.
+
 - Issue #21491: SocketServer: Fix a race condition in child processes reaping.
 
 - Issue #21635:  The difflib SequenceMatcher.get_matching_blocks() method