TestRunner support in test's build.gradle

* Fixes to tests
 * RunKonanTest runs tests build with TestRunner
 * Standalone tests

backend.native/tests/codegen/innerClass/superOuter.kt

@@ -12,6 +12,6 @@ open class Outer(val outer: String) {
 
 fun box() = Outer("Fail").value()
 
-fun main(args : Array<String>) {
+@Test fun runTest() {
     println(box())
 }