Added yun variant with LED_BUILTIN definition. Closes #1585

Author: Federico Fissore

boards.txt

@@ -35,7 +35,7 @@ yun.build.pid=0x8041
 yun.build.usb_product="Arduino Yun"
 yun.build.board=AVR_YUN
 yun.build.core=arduino
-yun.build.variant=leonardo
+yun.build.variant=yun
 yun.build.extra_flags={build.usb_flags}
 
 ##############################################################

variants/yun/pins_arduino.h

@@ -0,0 +1,27 @@
+/*
+  pins_arduino.h - Pin definition functions for Arduino
+  Part of Arduino - http://www.arduino.cc/
+
+  Copyright (c) 2013 Arduino LLC
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+
+  $Id: wiring.h 249 2007-02-03 16:52:51Z mellis $
+*/
+
+#include "../leonardo/pins_arduino.h"
+
+#define LED_BUILTIN 13