Separate readline initialization into new function PyOS_ReadlineInit().

For Dave Ascher's readline extensions.

Parser/myreadline.c

@@ -100,14 +100,9 @@ my_fgets(buf, len, fp)
 #endif /* WITH_READLINE */
 
 
-char *
-my_readline(prompt)
-	char *prompt;
+void
+PyOS_ReadlineInit()
 {
-	int n;
-	char *p;
-#ifdef WITH_READLINE
-	RETSIGTYPE (*old_inthandler)();
 	static int been_here;
 	if (!been_here) {
 		/* Force rebind of TAB to insert-tab */
@@ -115,6 +110,18 @@ my_readline(prompt)
 		rl_bind_key('\t', rl_insert);
 		been_here++;
 	}
+}
+
+
+char *
+my_readline(prompt)
+	char *prompt;
+{
+	int n;
+	char *p;
+#ifdef WITH_READLINE
+	RETSIGTYPE (*old_inthandler)();
+	PyOS_ReadlineInit();
 	old_inthandler = signal(SIGINT, onintr);
 	if (setjmp(jbuf)) {
 #ifdef HAVE_SIGRELSE