[Bug-readline] windows build failure due to missing ifdef signal check in rl_echo_signal_char

[Mike Frysinger]

the rest of signals.c protects SIGQUIT/SIGTSTP usage with #ifdef's, but looks 
like this one function was missed in 6.0

--- a/signals.c
+++ b/signals.c
@@ -592,8 +592,12 @@ rl_echo_signal_char (sig)
   switch (sig)
     {
     case SIGINT:  c = _rl_intr_char; break;
+#if defined (SIGQUIT)
     case SIGQUIT: c = _rl_quit_char; break;
+#endif
+#if defined (SIGTSTP)
     case SIGTSTP: c = _rl_susp_char; break;
+#endif
     default: return;
     }
 
-mike

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