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/tests/org/jetbrains/kotlin/integration/AntTaskJvmTest.java

@@ -101,6 +101,11 @@ public class AntTaskJvmTest extends AntTaskBaseTest {
         doJvmAntTest();
     }
 
+    @Test
+    public void withKotlinNoJavaSources() throws Exception {
+        doJvmAntTest();
+    }
+
     @Test
     public void javacCompiler() throws Exception {
         doJvmAntTest("-cp", getClassPathForAnt(),