fix(boards): 修复arduino下变量名大小写不敏感

boards/default_src/arduino/others/names.js

@@ -121,7 +121,7 @@ Names.prototype.getName = function (name, type) {
             name = varName;
         }
     }
-    var normalized = name.toLowerCase() + '_' + type;
+    var normalized = name + '_' + type;
 
     var isVarType = type == Variables.NAME_TYPE ||
         type == Names.DEVELOPER_VARIABLE_TYPE;
@@ -193,7 +193,7 @@ Names.prototype.safeName_ = function (name) {
  * @return {boolean} True if names are the same.
  */
 Names.equals = function (name1, name2) {
-    return name1.toLowerCase() == name2.toLowerCase();
+    return name1 == name2;
 };
 
 export default Names;