io-console for jruby.

console.c.diff

--- console.c.orig	2011-09-09 04:59:09.000000000 +0900
+++ console.c	2011-09-09 05:08:30.000000000 +0900
@@ -4,6 +4,9 @@
  */
 #include "ruby.h"
 #include "rubyio.h"
+
+#include <errno.h>
+
 #ifndef HAVE_RB_IO_T
 typedef OpenFile rb_io_t;
 #endif
@@ -380,7 +383,11 @@
     if (rb_const_defined(klass, id_console)) {
 	con = rb_const_get(klass, id_console);
 	if (TYPE(con) == T_FILE) {
+#ifdef JRUBY
+	    if ((fptr = jruby_io_struct(con)) && GetReadFD(fptr) != -1)
+#else
 	    if ((fptr = RFILE(con)->fptr) && GetReadFD(fptr) != -1)
+#endif
 		return con;
 	}
 	rb_mod_remove_const(klass, ID2SYM(id_console));