patch 8.2.3751: cannot assign a lambda to an option that takes a function

Problem:    Cannot assign a lambda to an option that takes a function.
Solution:   Automatically convert the lambda to a string. (Yegappan
            Lakshmanan, closes #9286)
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 52e5ac8..31d06b2 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -6072,7 +6072,7 @@
 /*
  * For one assignment figure out the type of destination.  Return it in "dest".
  * When not recognized "dest" is not set.
- * For an option "opt_flags" is set.
+ * For an option "option_scope" is set.
  * For a v:var "vimvaridx" is set.
  * "type" is set to the destination type if known, unchanted otherwise.
  * Return FAIL if an error message was given.
@@ -6082,7 +6082,7 @@
 	char_u		*name,
 	assign_dest_T	*dest,
 	int		cmdidx,
-	int		*opt_flags,
+	int		*option_scope,
 	int		*vimvaridx,
 	type_T		**type,
 	cctx_T		*cctx)
@@ -6102,7 +6102,7 @@
 	    return FAIL;
 	}
 	p = name;
-	p = find_option_end(&p, opt_flags);
+	p = find_option_end(&p, option_scope);
 	if (p == NULL)
 	{
 	    // cannot happen?
@@ -6112,7 +6112,7 @@
 	cc = *p;
 	*p = NUL;
 	opt_type = get_option_value(skip_option_env_lead(name),
-						    &numval, NULL, *opt_flags);
+					   &numval, NULL, NULL, *option_scope);
 	*p = cc;
 	switch (opt_type)
 	{