examples: Catch SIGINT instead of mapping Ctrl-C, use default Ctrl-D

We want Ctrl-C to work as in Bash, so let's just catch SIGINT (and do
nothing).  Also, the default Ctrl-D handler does what we want, i.e.
exit the CLI when we're on an empty line.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

examples/cli.c

@@ -98,37 +98,29 @@ el_status_t list_possible(void)
     return el_ring_bell();
 }
 
-el_status_t do_break(void)
-{
-    puts("Breakout!");
-    return CSeof;
-}
-
-el_status_t do_exit(void)
-{
-    puts("Bye bye!");
-    return CSeof;
-}
-
 el_status_t do_suspend(void)
 {
     puts("Abort!");
     return CSstay;
 }
 
+static void breakit(int signo)
+{
+}
+
 int main(void)
 {
     char *line;
     char *prompt = "cli> ";
     char *passwd = "Enter password: ";
 
+    signal(SIGINT, breakit);
+
     /* Setup callbacks */
     rl_set_complete_func(&my_rl_complete);
     rl_set_list_possib_func(&my_rl_list_possib);
 
     el_bind_key('?', list_possible);
-    el_bind_key(CTL('C'), do_break);
-    el_bind_key(CTL('D'), do_exit);
     el_bind_key(CTL('Z'), do_suspend);
     read_history(HISTORY);