Make KotlinNativeCompile implement the <...>.dsl.KotlinCompile interface

This is required for KotlinCompilation to be able to generically expose
the Kotlin compile tasls.

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/KotlinNativeTasks.kt

@@ -12,7 +12,8 @@ import org.jetbrains.kotlin.compilerRunner.KonanCompilerRunner
 import org.jetbrains.kotlin.compilerRunner.KonanInteropRunner
 import org.jetbrains.kotlin.compilerRunner.konanHome
 import org.jetbrains.kotlin.compilerRunner.konanVersion
-import org.jetbrains.kotlin.gradle.dsl.KotlinCommonToolOptions
+import org.jetbrains.kotlin.gradle.dsl.KotlinCommonOptions
+import org.jetbrains.kotlin.gradle.dsl.KotlinCompile
 import org.jetbrains.kotlin.gradle.dsl.kotlinExtension
 import org.jetbrains.kotlin.gradle.plugin.LanguageSettingsBuilder
 import org.jetbrains.kotlin.gradle.plugin.mpp.DefaultCInteropSettings
@@ -81,7 +82,7 @@ private fun FileCollection.filterOutPublishableInteropLibs(project: Project): Fi
 
 // endregion
 
-open class KotlinNativeCompile : AbstractCompile() {
+open class KotlinNativeCompile : AbstractCompile(), KotlinCompile<KotlinCommonOptions> {
 
     init {
         sourceCompatibility = "1.6"
@@ -156,7 +157,15 @@ open class KotlinNativeCompile : AbstractCompile() {
     // endregion.
 
     // region DSL for compiler options
-    private inner class NativeCompilerOpts : KotlinCommonToolOptions {
+    private inner class NativeCompilerOpts : KotlinCommonOptions {
+        override var apiVersion: String?
+            get() = languageSettings?.apiVersion
+            set(value) { languageSettings!!.apiVersion = value }
+
+        override var languageVersion: String?
+            get() = this@KotlinNativeCompile.languageVersion
+            set(value) { languageSettings!!.languageVersion = value }
+
         override var allWarningsAsErrors: Boolean = false
         override var suppressWarnings: Boolean = false
         override var verbose: Boolean = false
@@ -170,13 +179,13 @@ open class KotlinNativeCompile : AbstractCompile() {
     }
 
     @Internal
-    val kotlinOptions: KotlinCommonToolOptions = NativeCompilerOpts()
+    override val kotlinOptions: KotlinCommonOptions = NativeCompilerOpts()
 
-    fun kotlinOptions(fn: KotlinCommonToolOptions.() -> Unit) {
+    override fun kotlinOptions(fn: KotlinCommonOptions.() -> Unit) {
         kotlinOptions.fn()
     }
 
-    fun kotlinOptions(fn: Closure<*>) {
+    override fun kotlinOptions(fn: Closure<*>) {
         fn.delegate = kotlinOptions
         fn.call()
     }