re-added castAsChar()

re-added castAsChar() as per comment

libraries/joomla/database/query.php

@@ -405,6 +405,25 @@ public function call($columns)
 		return $this;
 	}
 
+	/**
+	 * Casts a value to a char.
+	 *
+	 * Ensure that the value is properly quoted before passing to the method.
+	 *
+	 * Usage:
+	 * $query->select($query->castAsChar('a'));
+	 *
+	 * @param   string  $value  The value to cast as a char.
+	 *
+	 * @return  string  Returns the cast value.
+	 *
+	 * @since   11.1
+	 */
+	public function castAsChar($value)
+	{
+		return $value;
+	}
+
 	/**
 	 * Gets the number of characters in a string.
 	 *