Kotlin: Remove unused ODASA_TOOLS variable

Author: igfoo

java/kotlin-extractor/src/main/java/com/semmle/util/process/Env.java

@@ -82,10 +82,6 @@ public enum Var {
 		 * The location where our queries are kept.
 		 */
 		ODASA_QUERIES,
-		/**
-		 * The location of the 'tools' directory
-		 */
-		ODASA_TOOLS,
 		/**
 		 * Whether we are running in 'prototyping mode'.
 		 */