Refresh Python/importlib.h and Python/importlib_external.h (#464)

diff --git a/Python/importlib.h b/Python/importlib.h
index 195fbfd..4607c40 100644
--- a/Python/importlib.h
+++ b/Python/importlib.h
@@ -392,7 +392,7 @@
     111,118,101,100,197,0,0,0,115,2,0,0,0,0,8,114,
     58,0,0,0,114,33,0,0,0,41,1,218,9,118,101,114,
     98,111,115,105,116,121,99,1,0,0,0,1,0,0,0,3,
-    0,0,0,5,0,0,0,71,0,0,0,115,54,0,0,0,
+    0,0,0,4,0,0,0,71,0,0,0,115,54,0,0,0,
     116,0,106,1,106,2,124,1,107,5,114,50,124,0,106,3,
     100,6,131,1,115,30,100,3,124,0,23,0,125,0,116,4,
     124,0,106,5,124,2,142,0,116,0,106,6,100,4,141,2,