Kotlin: Remove unused SEMMLE_DIST

Author: igfoo

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

@@ -50,10 +50,6 @@ public enum Var {
 		 * The location of any caches used by the toolchain, including compilation caches, trap caches, etc.
 		 */
 		SEMMLE_CACHE,
-		/**
-		 * The location of the toolchain files, including the odasa jar, our queries etc.
-		 */
-		SEMMLE_DIST,
 		/**
 		 * If running from a git tree, the root of the tree.
 		 */