minor updates for 5.3-rc1 release

lib/readline/examples/rl-callbacktest.c

@@ -79,9 +79,11 @@ main (int c, char **v)
   /* Set the default locale values according to environment variables. */
   setlocale (LC_ALL, "");
 
+#if defined (SIGWINCH)
   /* Handle window size changes when readline is not active and reading
      characters. */
   signal (SIGWINCH, sighandler);
+#endif
   
   /* Install the line handler. */
   rl_callback_handler_install (prompt, cb_linehandler);

lib/readline/examples/rlptytest.c

@@ -337,7 +337,9 @@ main(int c, char **v)
   if (val == -1)
     return -1;
 
+#ifdef SIGWINCH
   signal (SIGWINCH, sigwinch);
+#endif
   signal (SIGINT, sigint);
 
   val = init_readline (slavefd, slavefd);