BC native tests port to Konan's TestRunner

backend.native/tests/codegen/boxing/boxing8.kt

@@ -1,9 +1,13 @@
+package codegen.boxing.boxing8
+
+import kotlin.test.*
+
 fun foo(vararg args: Any?) {
     for (arg in args) {
         println(arg.toString())
     }
 }
 
-fun main(args: Array<String>) {
+@Test fun runTest() {
     foo(1, null, true, "Hello")
 }