Issue #13959: Continue to try to accomodate altsep in importlib by not
ignoring altsep if it already exists on a path when doing a join.
diff --git a/Python/importlib.h b/Python/importlib.h
index c6c5618..4b1001d 100644
--- a/Python/importlib.h
+++ b/Python/importlib.h
Binary files differ