lib1513: fix callback proto to silence warning

tests/libtest/lib1513.c

@@ -30,9 +30,17 @@
 
 #include "memdebug.h"
 
-static int progressKiller(void *arg)
+static int progressKiller(void *arg,
+                          double dltotal,
+                          double dlnow,
+                          double ultotal,
+                          double ulnow)
 {
   (void)arg;
+  (void)dltotal;
+  (void)dlnow;
+  (void)ultotal;
+  (void)ulnow;
   return 1;
 }