patch 7.4.1166

Problem:    Can't encode a Funcref into JSON.  jsonencode() doesn't handle the
            same list or dict twice properly.  (Nikolay Pavlov)
Solution:   Give an error.  Reset copyID when the list or dict is finished.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1166,
 /**/
     1165,
 /**/