Ant task - CompileEnvironment is used + "buildToolsTest" verifies <java> output

build-tools/test/hello/4/Hello.kt

@@ -0,0 +1,9 @@
+fun main(args : Array<String>) {
+  val language = if (args.size == 0) "EN" else args[0]
+  System.out?.println(when (language) {
+    "EN" -> "Hello!"
+    "FR" -> "Salut!"
+    "IT" -> "Ciao!"
+    else -> "Sorry, I can't greet you in $language yet"
+  })
+}