Fix javaOutputDir changed to the JAR, which was breaking unit tests

internal visibility, because they did not get the JAR into classpath

Issue #KT-20212 Fixed

(cherry picked from commit 19e861b)

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/AndroidProject/Lib/src/test/kotlin/internalTest.kt

@@ -0,0 +1,6 @@
+import lib.internalLibFun
+
+fun main(args: Array<String>) {
+    // check that unit tests can access internals of the main variant:
+    internalLibFun()
+}