patch 7.4.1559

Problem:    Passing cookie to a callback is clumsy.
Solution:   Change function() to take arguments and return a partial.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1559,
 /**/
     1558,
 /**/