Remove Antlr4BuildTasks environmental variables
Remove Antlr4BuildTasks environmental variables

Antlr4BuildTasks (https://github.com/kaby76/Antlr4BuildTasks) does not use *any* environmental variables. Everything for the build is seamlessly in the build tool.
kaby76/AntlrVSIX,kaby76/AntlrVSIX,kaby76/AntlrVSIX,kaby76/AntlrVSIX,kaby76/AntlrVSIX