M2 Mac JDK Download Support

Java doesn't automatically install on M2 Mac's. A co-worker of mine ran into this problem. I dug into it just a little bit, and I think the code that needs updating is here:

https://github.com/kaby76/Antlr4BuildTasks/blob/master/Antlr4BuildTasks/Tasks/RunAntlrTool.cs

Thanks! Greg

closing - accidentally created a duplicate. please see #78