[K/N] Konan: override artifact property to use with OutputDirectory

kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/konan/tasks/KonanCompileTask.kt

@@ -391,6 +391,9 @@ open class KonanCompileFrameworkTask: KonanCompileNativeBinary() {
 }
 
 open class KonanCompileLibraryTask: KonanCompileTask() {
+    override val artifact: File
+        @OutputDirectory get() = destinationDir.resolve(artifactFullName)
+
     override val artifactSuffix: String
         @Internal get() = if (!noPack) produce.suffix(konanTarget) else ""