lazarus 检测内存泄漏

用法：不要手工添加heaptrc单元，应该在编译选项中勾选

Using heaptrc in Lazarus

To enable this in your Lazarus project:

1. Go to Project Options/Linking and
2. in the Debugging section enable Use Heaptrc unit (check for mem-leaks) (-gh)

详见：https://wiki.freepascal.org/heaptrc