patch 8.2.2526: build failure

Problem:    Build failure.
Solution:   Change lookup_scriptvar() arguments.
diff --git a/src/proto/evalvars.pro b/src/proto/evalvars.pro
index ce160d7..144dc7c 100644
--- a/src/proto/evalvars.pro
+++ b/src/proto/evalvars.pro
@@ -60,7 +60,7 @@
 dictitem_T *find_var(char_u *name, hashtab_T **htp, int no_autoload);
 dictitem_T *find_var_in_ht(hashtab_T *ht, int htname, char_u *varname, int no_autoload);
 hashtab_T *get_script_local_ht(void);
-int lookup_scriptvar(char_u *name, size_t len, void *lvar, cctx_T *dummy);
+int lookup_scriptvar(char_u *name, size_t len, cctx_T *dummy);
 hashtab_T *find_var_ht(char_u *name, char_u **varname);
 char_u *get_var_value(char_u *name);
 void new_script_vars(scid_T id);