patch 9.0.0481: in :def function all closures in loop get the same variables

Problem:    In a :def function all closures in a loop get the same variables.
Solution:   Use a separate list of variables for LOADOUTER and STOREOUTER.
            Not copied at end of loop yet.
diff --git a/src/userfunc.c b/src/userfunc.c
index 35ce3f3..f0e9cd7 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -2452,7 +2452,12 @@
  * This is for when a compiled function defines a global function.
  */
     int
-copy_func(char_u *lambda, char_u *global, ectx_T *ectx)
+copy_lambda_to_global_func(
+	char_u	*lambda,
+	char_u	*global,
+	short	loop_var_idx,
+	short	loop_var_count,
+	ectx_T	*ectx)
 {
     ufunc_T *ufunc = find_func_even_dead(lambda, FFED_IS_GLOBAL);
     ufunc_T *fp = NULL;
@@ -2519,7 +2524,8 @@
 
 	if (pt == NULL)
 	    goto failed;
-	if (fill_partial_and_closure(pt, ufunc, ectx) == FAIL)
+	if (fill_partial_and_closure(pt, ufunc, loop_var_idx, loop_var_count,
+								 ectx) == FAIL)
 	{
 	    vim_free(pt);
 	    goto failed;