TestRunner support in test's build.gradle

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

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

@@ -45,6 +45,6 @@ class A: ABase() { // implicit label @A
 
 fun box() = A().B().bar(D())
 
-fun main(args : Array<String>) {
+@Test fun runTest() {
     println(box())
 }

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

@@ -19,6 +19,6 @@ class Outer(val x: Int) {
     }
 }
 
-fun main(args : Array<String>) {
+@Test fun runTest() {
     Outer(42).Inner().InnerInner("zzz")
 }

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())
 }