Close #13007: whichdb should recognize gdbm 1.9 magic numbers
diff --git a/Lib/whichdb.py b/Lib/whichdb.py
index f077f87..9071430 100644
--- a/Lib/whichdb.py
+++ b/Lib/whichdb.py
@@ -91,7 +91,7 @@
         return ""
 
     # Check for GNU dbm
-    if magic == 0x13579ace:
+    if magic in (0x13579ace, 0x13579acd, 0x13579acf):
         return "gdbm"
 
     # Check for old Berkeley db hash file format v2