Always run kotlinc in <withKotlin/> Ant task

This change requires withKotlin to be run with Ant of version at least 1.8.2.

Some test data changed because now compileList contains both Java and Kotlin
sources

 #KT-7870 Fixed

compiler/testData/integration/ant/jvm/withKotlinNoJavaSources/hello.kt

@@ -0,0 +1,5 @@
+package hello
+
+fun main(args: Array<String>) {
+    println("Hello!")
+}