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/build.log.expected

@@ -0,0 +1,14 @@
+OUT:
+Buildfile: [TestData]/build.xml
+
+build:
+    [mkdir] Created dir: [Temp]/classes
+    [javac] Compiling 1 source file to [Temp]/classes
+    [javac] Compiling [[TestData]] => [[Temp]/classes]
+    [javac] Running javac...
+      [jar] Building jar: [Temp]/hello.jar
+
+BUILD SUCCESSFUL
+Total time: [time]
+
+Return code: 0