Re-add the deprecated get_/set_favicon()

These shouldn't have been removed without deprecating them. Instead, use
an external service to handle all of that for us, and throw deprecated
errors when people try to use them.

library/SimplePie.php

@@ -2911,6 +2911,36 @@ public function get_items($start = 0, $end = 0)
 		}
 	}
 
+	/**
+	 * Set the favicon handler
+	 *
+	 * @deprecated Use your own favicon handling instead
+	 */
+	public function set_favicon_handler($page = false, $qs = 'i')
+	{
+		$level = defined('E_USER_DEPRECATED') ? E_USER_DEPRECATED : E_USER_WARNING;
+		trigger_error('Favicon handling has been removed, please use your own handling', $level);
+		return false;
+	}
+
+	/**
+	 * Get the favicon for the current feed
+	 *
+	 * @deprecated Use your own favicon handling instead
+	 */
+	public function get_favicon()
+	{
+		$level = defined('E_USER_DEPRECATED') ? E_USER_DEPRECATED : E_USER_WARNING;
+		trigger_error('Favicon handling has been removed, please use your own handling', $level);
+
+		if (($url = $this->get_link()) !== null)
+		{
+			return 'http://g.etfv.co/' . urlencode($url);
+		}
+
+		return false;
+	}
+
 	/**
 	 * Sorting callback for items
 	 *