Fix strict-aliasing rules errors on gcc 4.8.5. (GH-16714)

(cherry picked from commit c39d1ddc012987e2159a997e27665d2d579c0ce0)

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 31f962d..a6ddf70 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -1129,7 +1129,7 @@
     MAINTAIN_TRACKING(mp, key, value);
 
     size_t hashpos = (size_t)hash & (PyDict_MINSIZE-1);
-    PyDictKeyEntry *ep = &DK_ENTRIES(mp->ma_keys)[0];
+    PyDictKeyEntry *ep = DK_ENTRIES(mp->ma_keys);
     dictkeys_set_index(mp->ma_keys, hashpos, 0);
     ep->me_key = key;
     ep->me_hash = hash;