Disable implementation-defined special control characters

In raw mode with interrupt enabled.

Author: nobu

ext/io/console/console.c

@@ -187,7 +187,7 @@ set_rawmode(conmode *t, void *arg)
 #ifdef ISIG
 	if (r->intr) {
 	    t->c_iflag |= BRKINT|IXON;
-	    t->c_lflag |= ISIG|IEXTEN;
+	    t->c_lflag |= ISIG;
 	}
 #endif
 	(void)r;

test/io/console/test_io_console.rb

@@ -337,6 +337,16 @@ def test_intr
         assert_ctrl("#{cc.ord}", cc, r, w)
         assert_ctrl("Interrupt", cc, r, w)
       end
+      if cc = ctrl["dsusp"]
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+      end
+      if cc = ctrl["lnext"]
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+        assert_ctrl("#{cc.ord}", cc, r, w)
+      end
     end
   end